Jeff, I've been thinking of making this page too. Great idea. Another idea I have is to come up with a picture of each grille from 73-87 (91) for both Chevrolet and GMC. My trucks will be a start... 
Anyhow, I think it might be worth noting the differences between the 73-74 instrument cluster bezels the use the backlit wiper switch lettering vs the others that will fit the 73-80 dash pad. That is something many people would find useful since dash bezels are commonly in need of replacement when restoring or restifying these trucks.
I'll add more if I think of them...
__________________
Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed
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