What threads are the seatbelts in a vintage mustang?
 

THinking of throwing a threaded backing plate into my 67 fastback before I finish up the body, and wondering what thread it was? Actually, more importantly, I'm wondering where they go.. I heard there were provisions for shoulder belts starting in 67 (But not installed on cars until 68), and I see 3 sets of holes above the door.. One at the very rear, another about 6" forward, and then another set.. I don't want to cover up the headliner holes obviously, but I'm sure one of those holes can be used.. The very rear set of holes has a rectangular hole beside them? Thanks

Off the top of my head, I'm going to say that they are 7/16" or 1/2" fine thread.

Maybe Stu will pop in with a definite answer. :)


cheers
Ed N.

Heya.. Yeah, I think I found earlier tonight that they are 7/16 20.. but my tap won't go through an old one nicely, so I don't want to risk it.. But what I really don't want to risk is welding in a seatbelt bracket where th eheadliner or something else is supposed to go.. :D

7/16 fine. Had to go digging for my old belts in the garage! Stu

I believe the hole with the square hole beside it is the one for the 3 point provision. It allows the factory to install the captive nut mounting hardware.

I'll just go out in my driveway and slash Ed's Cougar's headliner and take a look at his '68's shoulder belts!!! :shakeit: Stu

Just tell him it's for a good cause!

http://www3.sympatico.ca/gkrikorian/seatbelt.JPG

Would it be hole #1 or #2, or none of the above? What do all those holes do, anyways? :D

The "a" hole ( he said a hole :LOL: ) is the bolt hole. All those others are for the headliner bows ( you young fellers growing up with mere fuzzy cardboard headliners!) The square beside it is where the assembler would insert the speed nut mounting fixture.

http://www.472ci-67mustang.com/Seat_...lts-thumbs.htm

This is a good article for a home made retro fit. It's in a coupe but the FB will be pretty similar. Stu

You mean the #2 whole (a?! :D ) .. What is the one I labelled #1 then? Looks to be bigger than the other headliner holes.. Actually, looks to be a mirror image of #2 (Big hole with a smaller one beside it).. Does that mean I can cover up the smaller hole beside #2, or is that necessary for the headliner as well?

Johnny, I just saw this. I will look at the Fastback when I get home today. The headliner is out, so, it should be easy to see.
Mike.