2000 XC300 rear brake questions

[Adam500]

Restoring a beat up 2000 XC300.
It has an aftermarket aluminum rear caliper mount/disk guard made my Scotts.
I seem to be missing the thin steel hardware where the end of the brake pads sit/slide in.
Worse yet the aluminum has worn thru so the pads just spin on the pinned end when the brake is applied.
Where can I get a replacement caliper mount and hardware for caliper?
OEM is fine. does not need to be a disk guard combo.
Are there a parts interchange for Japanese bikes?
I have the ability to weld aluminum and might be able to save the Scotts mount but I need the steel hardware the brake pad sits in.