Rick, Give a call to Jim Carter Antique truck parts, 1 800 862-1913. Only snag is which part on your truck are from the Chevy and which are GMC? Also you may try the classified section on this site. Also you may try NAPA.
Best of luck
Jim


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed