The Waiex hardware list calls for 6 "Southco 82-35-302-15" fasteners in the fuselage hardware kit. To complete this page you need 7 of the fasteners.
When drilling pilot holes in the stainless steel, use maximum pressure and low drill speed. Here's a video I made of a useful method for drilling all of the holes on this page.
https://www.youtube.com/watch?v=OW64A-7 ... _xTCfuP7iwThe flanges in the upper firewall former will need to be almost completely modified to provide good contact for rivets while maintaining the flat/straight surface of the former.