Dealer? Dealer? E-Bay?
No, auto parts stores show different part numbers.
Some parts can be found for older vehicles, like the 1978 Chevy Caprice Classic, at salvage yards. Some parts for older cars are also still being manufactured, so they might also be available at automotive parts stores.
Depending on what parts you need, just about any Caprice parts from a 1980-1990 would work on an 84, or an 80-85 Impala.
Carjunky.com stocks OEM parts for the 1990 Caprice. You can access the site online at http://www.carjunky.com or call them at 800-775-0519.
Most engine/drivetrain parts can be bought off the shelf at any reputable parts store.
Have vehicle scanned to determine problem and have codes cleared Auto parts store can do this
Door panels for a 1975 Chevy Caprice Classic 2 door might be found in a salvage yard. Rock Auto is also a good source for aftermarket parts for most vehicles.
Not from the factory. Replacement parts could though.
Yes, several home improvement stores or authorized factory retailers carry replacement parts.
Try GM classic parts on Ebay,I get a lot of used parts from them
Depends on what parts you're referring to, but most parts would be interchangeable
Go to a parts house or bookstore and buy a Haynes Manual that is specific to your car.