I have what looks like it could be a home built kart with three bolt hubs on the back. It is a double flange hub setup with just a single drive wheel. The issue is, right now it only has the paddle style brakes that press on the tires - I would like to upgrade to at least a drum brake. BUT the bolt pattern appears to be 3 bolt with 2-5/8 center to center, which is around 3" bolt circle (my drawing/math has it at 3.031" circle). I'm having a hard time finding drums with this bolt pattern. Anyone have any info? Am I better off making a hub with the wheel bolt pattern on one side and a more common on the other? Scrap the rear wheels and buy new with something more common? Any advice would be helpful.