The Bolts should be the same as my 1985.
Bolts are 5/16" X 18 Thread
You will have six (6) long bolts with washer head for Header - 2-1/2 " X 5/16-18
(Edit 09-18-23 to 2-1/2" from 2-1/5")
You will have ten (10) short bolts for base to body - 1" X 5/16-18
I purchased some extra ones to have on hand.
My recommendation if you want factory is to contact:
Cory Buhrman - Owner,
New Boyz Square Body Rescue
717-830-9330
He has gotten me several things that i needed for my full restoration. I know he has helped a friend of mine in Dallas, TX with some of his unusual requests as well.
I did buy some temporary bolts for the top to transport it to the Paint and Body shop while I sent my original bolts to a re-chrome d in Houston, TX.
Our Local M&D hardware store had the Hex Bolts with washers.
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