Update - screws do not fit. Washer is too big, but screw itself is right thread/length.There are 4 more bolts (8 total, 4 stay without splitter) and 21 rivets.
I ordered these rivets - https://www.fastener.zone/products/auveco-13751-1274-ford-w704342-s300 We'll see if they are correct. Rivet gun - need a bigger one, as I think I read these are 1/4" shank. Harbor Freight sells one that goes that big. 4 bolts -I ordered these based on the Ford part # - https://www.amazon.com/gp/product/B085MY7J6B/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
No ETA on the rivets yet (ordered Friday), so I can't report back yet.