3 point seat belt bolts

[outkastdually]

does anybody know what size and thread the upper (shoulder) bolt is? I have a 73 dually but I would assume the same bolt is used in all 73-87

[Captkaos]

Did you figure this out? 

[outkastdually]

still havnt figured it out lol, I would just go to a junk yard but I am not  close to one and I am recover from a serious double knee surgery, so walking around a junkyard is kinda hard right now, but there is a hardware store down the road!! I am about to just guess and buy a couple different sizes

[bake74]

     Here is a install of 3 point seat belts in a non 3 point seat belt truck.  It says "For Technical Assistance or Questions Call 860-872-1932."
     You could call them and ask if they know the size you are looking for.

[jetmech]

My '86 has a 1/2" 13 thread per inch special bolt that uses a 13/16" wrench. It is 1 1/4 inch long and approx. 11/16 of that length is a slightly larger shoulder. Hope this helps.

[DnStClr]

Same here. It looks like threadlocker (blue) is used on the threads.

[outkastdually]

thanks! I will give that size a try and hope it works in mine!