Its a bolt with the small plate brazed to the head - maybe 3/8" x 3/4". 1/4 CEI with a nut to lock it in place. The head of this bolt is a tall 3/16 head, which has the plate brazed to it.
So the bolt threads into the brake pedal from behind, and the locknut screws onto this bolt on the front
Original part numbers were 02-9245 - 1/4x26 nut
03-3019 - 1/4x26 stop light/brake pedal bolt for G15, N15, P11A