Good resources for buying GM restoration parts include GMPartsDirect.com, RestorationPartsSource.com and RockAuto.com, as of 2015. Additional sources for buying GM restoration parts include OERParts.com and Chevrolet.com.
GMPartsDirect.com sells restoration parts for a number of GM makes and models that include Chevrolet, Buick, Cadillac and Oldsmobile. It carries parts for model years that go as far back as 1958 and older. RestorationPartsSource.com sells parts for GM models that include Chevrolet Corvette, Oldsmobile Cutlass, Pontiac Firebird and Buick Skylark.
RockAuto is a family business that sells GM restoration parts worldwide from a number of manufacturers. OERParts.com sells GM-approved parts that cover nearly every element of car restoration including interior, trim pieces and mechanical components.