This is not a Mike Thomas bracket, not sure where you got that idea. As I understand it, the Mike Thomas bracket was designed around the Puch wheel disc conversion and EBRs.
There is another version of this bracket (designed around the "treats spoke disc" and EBRs), but it says it's for closed dropout EBRs, which I def don't have.
I haven't really looked at this since I took my lathe apart to CNC convert it. Can't make more spacers until that's back up later this month.
I'm sure I've got something flipped around or backwards from what treats designed, but I'm glad someone else thinks it's as much of a stumper as I do.