This similar topic I brought up once before. And the nearest I could determine was that 67-68's when they were two-toned with white on top also had the upper area of the door painted the body color with the white on the very bottom of cab / bed. 69 & 70 had the area above the door painted white along with the top of the cab. 71/72's had the white in the center of cab/ doors. (similar to the above pic) Unless it was repainted of course then all bets are off..
This information I got from a retired GM truck painter at the factory during that era.
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