I too only have experience with 70-71s but seem to recall hearing that later seats had only the one outboard adjuster track.
I used white lithium grease, which I believe matched what the factory did on seat sliders and window tracks.
@strycker
@Vaanth
I always appreciate Vaanth’s detailed and informative responses. In this case, I disagree on the 70 vs 71-72 positioners. I believe the later 3461770 and 3461771 parts had the raised area around the holes and are correct for 71-72 applications.
Here’s a pic of a some NOS...
The part number and date codes are stamped about 24 inches from the rear joint. Here's a pic of the original from my T/A with the 2883782 number with a C 70 date code. Trans Am cars (and some others I believe) had 7260 u-joints in front and 7290 in the rear.
AMK carries a variety of plastic straps. I’m guessing you can find them elsewhere if you can figure out what they’re called.
https://www.amkproducts.com/bulk-fasteners-products/?Product_ID=13201