I have motor mounts for Ollin 5065 motors and 30mm dia center to center (21mm x 21mm square center to center).
Pricing Clamp for Calliber trucks - 25.00 Motor mount for Ollin (38mm hole pattern) motor - 25.00 Motor mount with 30mm hole pattern - 25.00
If you bought ONE clamp and ONE motor mount together - 45.00 + free USA shipping
The mount is raw 6061 aluminum and comes with hardware for the mount and motor. It is fully adjustable- I am using 36/16 gearing with 255 belt and the mount still has room so could probably do 265 depending on gearing.