Which Bolts To Mount Windshield Frame?

Hello,

I'm piecing together my 81' CJ-5. Bought a windshield frame with glass already in off craigslist that came with the hinges with mirrors on them. There are also brackets on the inside bottom left and right of the windshield frame that I assume bolt in from there as well.

How do I go about mounting this properly? What size bolts do I need for these hinges and brackets?

There are a few already in that look like they require a Torx bit I am just unsure of size or what to replace them with. Thank you

 

Update: I ordered some online but the few results I found indicated 5/16 × 18 threaded bolt 3/4" in length