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Some minor door panel differences include different holes for power/manual windows, Holes for Grand Coupe only woodgrain trim and emblems and emblem holes for the word 'CUDA on all 'CUDAs.
The main difference on the door skins is 'CUDAS got little studs welded to the top of them for the door top chrome. All 'CUDAs got the chrome except for AAR 'CUDAs...