The numbering is fairly universal. There are some variations for the newer vehicles, but the old stuff is all the same.
When I installed one of these harnesses, I did have to add a couple of other wires for the Cdn model. One for the convoy light switch and thru to the convoy lamp, and of course a few extra for the turn signals. Also, depending on the year of your truck, you may or may not have the distributor filter (I think).
Use the M37 under dash harness, order a rear harness for the M35 or larger, and you will be most of the way there.
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