Caster adjustment

[Wally]

Is there a supplier that makes a top strut mount for '74 and later superbeetles (1303) that has slots for and aft to give more or less caster?
I rather not grind or file on the body where the strut mounts rest...

On the bug I already have the caster-plus bushings for the swaybar (Topline), but I really want an adjustable top strut caster mount (mainly for my 412 as it has the same top strut mounts as a late superbeetle )

Thanks,
Walter