Which Dash Frame Fasteners (early A)?

I don't know about the early cars, but these look like the later cars use. The frame was factory installed with bolt heads on top before the windshield went in. It's somewhat common to use a bit shorter, or trimmed bolts, and install the bolts from the bottom. This allows you to get the frame in/ out if necessary without pulling the windshield. I did this on my 67, it's not that difficult I kept about 3 spare screws full length to get things started, then replaced them with the short ones