Re: 69 Cyclone seat track bolts

[Virgil & Sue Klein]

I’m not sure about the hardness factor on seat attachment bolts.  I certainly would not use the softest metal as there can be a lot of stress on those bolts and the last thing you want coming loose in an accident would be the seat.  I don’t think I would use anything less than a grade 5.  I would guess you can by threaded stock by hardness at a decent auto parts store or hardware store.  I also like to use “a big ol’ honkin’ washer” (that would be a technical term) under the floor board to spread the forces out a little.