It's a shame to see a 1978-88 G-car treated like an AMC product, and parts are hard to locate.
The reason that I refer to 1973 and later vehicles being treated like AMC products is that parts are hard to locate. AMC is a defunct marque, like Studebaker, Packard, Kaiser, Willys, Checker, and Dusenberg. They do not have a parent company for replacement parts. This makes finding replacement components a nightmare, and often, leads to neglect.
GM, Ford, and DaimlerChrysler are parent manufacturers, but they limit their stock to late model vehicles. If the dealer does not have what you need, then the only alternative is to purchase a parts car or salvage the needed component, have the component refurbished (e.g. companies like Just Dashes), or purchase the needed part as an NOS item.
Keep in mind about the demand market. If the component is obsolete, and is needed for a resto, then the part in need is reproduced. Look at Goodmark Industries, in which they reproduce sheetmetal for any vehicle that is obsolete for the BiG 3.
The best thing to do is to find the needed components before they are gone, especially NOS or items that are still in stock. Like Porky Pig would say, "That's all, Folks!"
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Weyoun X (the tenth clone)
descendant of a former Chevelle owner
http://www.angelfire.com/tx/lonestarclassics/acar.html
1969 Chevelle Memories Page
http://members.tripod.com/~seributra_d/time_and_memories.htm
Chevelles (and A-cars) On Screen
http://www.geocities.com/MotorCity/Downs/5196/a_car.html
Disco-Era Classics
http://homepages.go.com/~55498/hooptie.htm