Rear tack strip bolt sizes

What fasteners are used to attach the rear tack strips? Are they all 1/4-20 bolts?
Three are two types of bolts on my car that are clearly factory correct. Both are 1/4-20 x 1.5" with either a round or large rectangular washer.

There are 4 other holes that have a variety of 5/16-18 bolts (and one hole with the weld-nut missing). I recognize some of the 5/16 from other parts of the car.

Robert


Edited:
I can't find how to delete the post, but ignore the question. I had a duh moment and went out in the back 40 to my other convertible. All of the weld-nuts are intact and they are 1/4-20. Looks like I have some rivnut installation ahead.
So, am I correct in thinking that the two fasteners in the picture are the only two types used?
And, are they reproduced?

RT




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