While working on the 50mm fuel pump mounting bracket and looking at existing images of similar brackets, I noticed there are small brackets designed for 31mm fuel filters. So, I quickly made a simple model of one to help anyone using these tiny filters.

This small bracket is made to hold 31mm diameter fuel filters. It has two holes for M3 bolts and a little recessed slot to allow the M3 nut to sit flush and not stick out.