The chart MoparCarGuy posted in this thread in February is really helpful - I needed to sort out the seat belt bolts for my 73 Challenger, which were mostly mixed up in a box. Some came from a 72 Challenger I had earlier. Three of them were rear seat belt bolts, still screwed in place in my current car. However, those three bolts are stamped C-13 and the "c" measurement, from the head of the bolt to the end, is 1 and 1/8 in. Is this an alternate bolt size for the C-11 (1.25 in) bolt?
I have several C-11 bolts, and two C-10 (1.38 in) bolts for the front seat retractors. I do not have any C-12 bolts (1.75 in) for the front seat buckles. Since I seem to have more C-11s than I need, do you think I can swap in a pair of them for the C-12s?
One last question: when screwing most of the bolts into place, they seem to stop before the end of the thread by a good quarter of an inch. Is this normal? I am working to clean up the threaded holes, but my 7/16-20 tap is straight, not tapered and it is kind of hard to use it to clean the threads out completely.
FYI, I bought a set of 3 point harnesses for my 72 Challenger in 1999. They were made in Taiwan; I forget who I ordered them from - they received little use before I began taking that car apart to try and restore it. The 72 had those shoulder harnesses you had to store up against the roof when not in use; they clipped to a stud on the lap belt clip. They were totally useless as other contributors here noted - when tightened they pulled the lap belt way up off the lap. The 3 point is vastly better. I assume my 73 came with regular 3 point harnesses but they are long gone...
Thank you!