So what is a G-body anyway? Well, this listing is the most comprehensive I've seen and it includes the A-body cars as well. For the purposes of this website, all the vehicles listed on this chart are considered G-Bodies.

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G-body:
1982-87 Buick Regal/Grand National
1982-87 Chevrolet El Camino
1982-83 Chevrolet Malibu
1982-88 Chevrolet Monte Carlo
1982-87 GMC Caballero
1982-88 Oldsmobile Cutlass RWD
1982-86 Pontiac Bonneville
1982-87 Pontiac Grand Prix

The similar A-bodies:
1978-81 Buick Century
1978-81 Buick Regal
1978-81 Chevrolet El Camino
1978-81 Chevrolet Malibu
1978-81 Chevrolet Monte Carlo
1978-81 GMC Caballero
1978-81 Oldsmobile Cutlass
1978-81 Pontiac LeMans/Grand Am
1978-81 Pontiac Grand Prix

NOTES:
1. There were no G-body cars before 1982.
2. The G-body designation came about in 1982 when the A-body line split
into FWD and RWD cars. The FWD's kept the A-body name while the RWD's were reclassified as G-body. (Kind of backwards- new cars/old name, old cars/new name.) Example: Buick Regal and Century were both A-bodies in 1981. In 1982, the Century went FWD, but still was called the A-body. The '82 Regal, while unchanged, was now a G-body.
3. The Regal, Monte Carlo, Cutlass, and Grand Prix were referred to as
A-specials (and G-specials after '82.)
4. The A-specials all received new sheetmetal in 1981. This helps to
confuse the A/G body issue. Had the name change coincided with the
sheetmetal change, things would make more sense.
5. Pre- '82 Bonneville were B-bodies.
6. Four door and Wagon models are included (i.e. Malibu).
7. G-bodies were produced until December 11, 1987. The LAST car was a 1987 GN. Some Monte Carlos and Cutlass's were sold as 1988 models, but were actually built in 1987. (Remember that model years tend to begin several months before the calendar year.) So during the last months of production, an '88 Monte could come the line, followed by an '87 Regal and then an '88 Cutlass.