interesting ,, my 71 has 72 doors from factory

[58 Special]

I converted my 71 GMC K15 suburban to 72 door panels over 25 years ago.
Finding a good set of regulators for the front was fairly easy then, as they are the same as all pickups. Finding rear window regulators for the back windows was another story. After looking for some time, I finally took my original rear regulators drilled out rivets and replaced with longer 72 posts. about 6 months later I stripped a 72 suburban with proper long posts. Those regulators are still on the shelf.

[1970cstblazer]

I modified my 1970 back in the early '90's for the 1972 door panels, window regs and latch controls, as I thought the earlier panels looked cheap. I found a pair of mint black 1972 panels in a local JY from a dark olive '72 CST. I will continue to use these during my current restoration, as with the 1972 accelerator pedal setup, as the 1970 rod system was meh..