Tim, I think that is right for all sizes of AD Chevy with possible exception or variation on lengths for the COE.
Otherwise the length between tail light and the main harness would change with wheelbase but the front harness would be the same best I can tell.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-