In 2001 Buick had the following models: LeSabre, Park Avenue, Regal, Century, & the Rendezvous.

In 2001 Cadillac had the following models:  Seville, DeVille, Eldorado, Catera, Escalade & the Escalade EXT.

In 2001 Chevrolet had the following models: Cavalier, Malibu, Impala, Camaro, Corvette, Monte Carlo, Prizm, S-10, Silverado, Astro, Express, Venture, Tracker, Blazer, Tahoe, & the Suburban.

In 2001 GMC had the following models:  Sierra, Sonoma, Yukon, Yukon XL, Jimmy, Safari, Savana, & the Envoy.

In 2001 Oldsmobile had the following models: Alero, Intrigue, Silhouette, Bravada & the Aurora.

In 2001 Pontiac had the following models:  Sunfire, Grand Am, Firebird, Bonneville, Montana, Grand Prix & the Aztek.

In 2001 Saturn had the following models:  S-Series (SL, SC, SW), L-Series (L100, L200, L300, LW200, LW300) & the SC2.

  In 2000, General Motors sold a total of approximately 4.66 million vehicles in the United States. This figure includes sales from all of its brands, such as Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile, and Saturn for a total of 7 brands and 45 models.
Buick had 5 models:
    Buick LeSabre: A full-size sedan, which was the entry-level full-size offering from Buick.
    Buick Park Avenue: A full-size luxury sedan, positioned above the LeSabre in terms of luxury and features.
    Buick Regal: A mid-size sedan, which was positioned between the Century and the Park Avenue in terms of size and luxury.
    Buick Century: A mid-size sedan, which was Buick's entry-level mid-size offering.
    Buick Riviera: A personal luxury coupe, which was the last model year for this generation of Riviera.
Cadillac had 5 models :

    Cadillac Seville: A mid-size luxury sedan available in two trims: SLS (Seville Luxury Sedan) and STS (Seville Touring Sedan).
    Cadillac DeVille: A full-size luxury sedan, offered in three trims: Base, DHS (DeVille High Luxury Sedan), and DTS (DeVille Touring Sedan).
    Cadillac Eldorado: A personal luxury coupe, available in two trims: ESC (Eldorado Sport Coupe) and ETC (Eldorado Touring Coupe).
    Cadillac Catera: A mid-size luxury sedan that was positioned as an entry-level model for Cadillac.
    Cadillac Escalade: A full-size luxury SUV, which was Cadillac's first entry into the SUV market. It shared its platform with the GMC Yukon and Tahoe.
Chevrolet had 15 models:

  Chevrolet Cavalier: A compact car available as a 2-door coupe, 4-door sedan, and 2-door convertible.
  Chevrolet Malibu: A mid-size sedan positioned between the Cavalier and the Impala.
  Chevrolet Impala: A full-size sedan that was reintroduced in 2000 after a three-year hiatus.
  Chevrolet Camaro: A sports car available as a 2-door coupe and 2-door convertible, sharing its platform with the Pontiac Firebird.
  Chevrolet Corvette: A high-performance sports car available as a 2-door coupe and 2-door convertible.
  Chevrolet Monte Carlo: A 2-door coupe based on the same platform as the Chevrolet Impala and sharing some mechanical components.
  Chevrolet S-10: A compact pickup truck available in various cab configurations and bed lengths.
  Chevrolet Silverado: A full-size pickup truck available in various cab configurations and bed lengths.
  Chevrolet Astro: A mid-size van available in both passenger and cargo configurations.
  Chevrolet Express: A full-size van available in various configurations, including passenger, cargo, and cutaway chassis versions.
  Chevrolet Venture: A minivan that was part of GM's "Dustbuster" minivan lineup, sharing similarities with the Montana and Silhouette.
  Chevrolet Tracker: A compact SUV that was a rebadged version of the Suzuki Vitara.
  Chevrolet Blazer: A mid-size SUV available in both 2-door and 4-door configurations.
  Chevrolet Tahoe: A full-size SUV available in both 2-door and 4-door configurations.
  Chevrolet Suburban: An extended-length full-size SUV based on the same platform as the Chevrolet Tahoe.
GMC had 6 models :

  GMC Sierra: A full-size pickup truck available in various cab configurations and bed lengths. The Sierra was mechanically similar to the Silverado.
  GMC Sonoma: A compact pickup truck, which was the GMC counterpart of the Chevrolet S-10.
  GMC Yukon: A full-size SUV available in both standard & ex-length (Yukon XL) versions. The Yukon was the counterpart of the Tahoe & Suburban.
  GMC Jimmy: A mid-size SUV, which was the GMC counterpart of the Chevrolet Blazer. It shared its platform with the Oldsmobile Bravada as well.
  GMC Safari: A mid-size van available in both passenger and cargo configurations. The Safari was the GMC counterpart of the Chevrolet Astro.
  GMC Savana: A full-size van available in various confs, including pass, cargo, & cutaway chassis versions. The Savana was the counter to the Express.
Oldsmobile had 5 models :

  Oldsmobile Alero: A compact car available as a 2-door coupe or a 4-door sedan.
  Oldsmobile Intrigue: A mid-size sedan that replaced the Oldsmobile Cutlass Supreme.
  Oldsmobile Silhouette: A minivan that was part of GM's "Dustbuster" minivan lineup, sharing similarities with the  Venture and Montana.
  Oldsmobile Bravada: A mid-size luxury SUV, which was the upscale version of the Chevrolet Blazer and GMC Jimmy.
  Oldsmobile Aurora: A full-size luxury sedan that was the flagship model for Oldsmobile.
Pontiac had 6 models:

  Pontiac Sunfire: A compact car available as a 2-door coupe or a 4-door sedan. It was the successor to the Pontiac Sunbird.
  Pontiac Grand Am: A mid-size car available as a 2-door coupe or a 4-door sedan.
  Pontiac Firebird: A sports car available as a 2-door coupe or a 2-door convertible. It shared its platform with the Chevrolet Camaro.
  Pontiac Bonneville: A full-size sedan, which was the largest and most luxurious car in the Pontiac lineup.
  Pontiac Montana: A minivan, which was part of GM's "Dustbuster" minivan lineup, sharing similarities with the Venture and Silhouette.
  Pontiac Grand Prix: A mid-size car available as a 2-door coupe or a 4-door sedan.
Saturn had 3 models:

  Saturn S-Series: A compact car lineup, which included the following body styles: a. SL (Sedan Level): A 4-door sedan available in three trims - SL, SL1, and SL2. b. SC (Sport  Coupe): A 3-door coupe available in two trims - SC1 and SC2. c. SW (Station Wagon): A 4-door wagon available in two trims - SW1 and SW2.
  Saturn L-Series: A mid-size car lineup, which was introduced in 2000 and included the following body styles: a. L-Series Sedan: A 4-door sedan available in two trims - LS and LS1. b. L-Series Wagon: A 4-door wagon available in a single trim - LW1.
  Saturn SC2: A 2-door coupe that was part of the S-Series lineup, but it had a separate and distinct design compared to the SC1.

1999 Chevrolet Mexico Paint Chart