Upper grill to lower grill uses the bolts shown in he photo. Rivet head bolts (8) are used to attach the upper grill to the lower grill. The nuts with integral lock washers are ¾” long zinc plated steel. If I remember correctly they are 1/4" bolts.
The second photo is the Upper Grill Screws (Grill) ¾” Pan Head. Requires 4 Hope this helps Harold
