Help with pedal install

[Baker819]

I took apart my truck maybe 6 years ago. Sadly in my burnt-out state I can not figure out how the gas pedal of all thing mounts. Searched the internet... no real help. I factory insulation on the firewall that has no places for holes. No obvious places for a bracket to be mounted, because just bolting the pedal assembly to the floor right now wouldn't work as it needs a lot of room to move. I'd appreciate any help you guys can provide.