In a previous post topic in a different thread somewhere about mounting a 26D from the can drive that the availability of a period correct "manufactured" bolt on motor bracket was ever produced.
Apparently Classic Industry manufactured 2 mounts. The included axle oil lite "extra wide" bearings provide excellent frame bracing opportunities.
1. part number #2636 mount was for endbell mounting.
2. part number #2640 mount was for can end mounting.
Fit up was perfect.
If your building a rear mount can drive thingie here's a period correct mount to seek out.
regards; gene