Magnum going into '73 Dart...which spool mounts? Where to buy?

The problem is that ANY of the replacement mounts I've found, O' Really, NAPA, etc, all show the same part no for 318/ 360. I guess "they" just expect us to bend/ shim the bracket to fit.

Thanks, 67Dart273....

Ok... this makes sense.
Has anyone ever documented how they bent/shimmed their mount to work?