'71 Road Runner Fender to Cowl Brace

Hello all, does anyone happen to know what bolt is used to attach the fender to cowl brace to the cowl? Is it a self-tapper or bolt and nut or something else? It's the bolt circled in red.

This is the brace:


This is the bolt:

I believe they are 5/16-18 dog point with captured washer (aka 5/16 body bolts). You can usually find them in the help section

Amazon.com: (25) 5/16 18 x 1 3/16" Body Bolts 1/2" Hex 7/8" Washer : Industrial & Scientific

Hello all, for future reference: I was able to figure this out with the help of a seller on Ebay. There are welded square nuts (1/4" -20) that are supposed to be on the inside of the firewall. Since I replaced my firewall with AMD's, also correct for E Bodies, it did not have these nuts (and hole drilled) installed. The attachments to the fenders use a clip nut and the same 1/4" - 20 bolt as the firewall bolts.