From my experience, if you need an esoteric part for the M715, the best source of the part is ABLinn, Archer Bros, Memphis, Saturn Surplus, Surplus city, and VPW (ordered by typical price for comparable parts). These vendors are experienced in military vehicles and know what fits and what doesn't and have pretty large stockpiles of NOS and replacement parts.

As most of you are aware (or will become aware of shortly), the local auto parts suppliers know little to nothing about repairing cars today, much less about trucks made 40 years ago that aren't on their computer systems.

You may have to wait a little bit to get the part via mail, but often that is less time spent than searching numerous catalogs at NAPA only to find that the parts are unavailable or don't fit.

Just my $0.02.