Im sure this questions been asked at some time or anouther but can anyone tell me some of the A body cars and years that would be a match for a 71 bucket seat? I mainly need the frame and tracks that would work with chevelle parts. Thanks.

All the following would be 69-72 and 68 will fit but the majority of 68's didn't have headrests. Chevelle/GTO/Lemans/442/Cutlass/GS/Skylark/. Also 70-72 Monte Carlo.
Also B bodies have the same seat frames but the tracks are different. So you could put an B body frame with a set of A body tracks. B bodies are Impala/Bonneville /Catalina/Riviera/Tornado/Etc.