Where to find: SEAT BELT SHOULDER BOLT

[swissarmychainsaw]

I'm trying to add shoulder belts to my 73 Suburban (front and rear).

I found a set of the Shoulder (pivot) bolts that go into the B-Pillar, but for the life of me I can't find them new anywhere.

I'm hesitant to just buy a bolt from the hardware store since these are kind of specialty and the hardened versions are not quite the same from the local ACE.

Juliano's sells this bolt but it's a 3/16" Fine thread, and mine is more like
a 1/2 Coarse.



Where do I find this?

Thanks!
SEAT BELT SHOULDER BOLT