Electric fuel pump mounting?

I agree. Bolts, lock washers and nuts. Or, just a lock nut.

I mounted my Holley black pump on the frame just in front of the wheelwell. The frame has holes in the bottom to stick your finger in to start the washer and nut. I use grease to hold the washer and nut on my finger tip to get the nut started. I found one hole in the side of the frame for mounting, just had to drill one hole.

Muffler looks closer than it is.