Seat Bolt size

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This is what I have on my 1973. It’s a 7/16” thread with a 20NF pitch. The bolt of course has the 1/2” diameter shoulder that is also 1/2” in length.

You probably already know this but NPD and AMK sell these but are a bit pricey $16/seat

https://www.npdlink.com/product/mounting-kit-seat-belt-front-seats/105164

Hope this helps.
Bob
I read this as needing the bolts size for the seats, not the belts.
Without checking my car, I think they are 3/8-16 shoulder bolts and should be at least grade 5 bolts. Length is 1 1/2" if I remember.
 
Thank you yes they are 3/8 -16. I am making some cut off bolts ground to a point for new carpet install. Thought that might make finding hole location a little easier through the carpet.
 
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