Rollbar attaching bolts

[Road Reptile]

Hi 68 fans,
Need to know what the roof bolts are for the  rollbar. They are 13/16 and much like seatbelt bolts
But have 3/8" coarse threads and a small shoulder...if memory serves correct...also have some fine thread Type that fit in the floor for seatbelts.At least they were saved, Looks like some advertised have Torx head which can't be correct. Thanks for the help.
R.R.

[WT6066-2600]

Are these the bolts you are referring to?

https://www.ebay.com/itm/227062541013

[Road Reptile]

Hi again,
Yes that is what I think is proper-and have a pair that match, just want to verify so no threads are damaged. Thanks for the tip.
R.R.