Want to Buy WTB: Broken viewfinder/WLF for Mamiya TLR

HI

I know this is a bit of a long shot, but I'm looking for a broken waist level viewfinder (or porroflex/prism) for a Mamiya TLR. All I need to be complete is the actual mounting bracket.

Its for a project I have to make a focus assist for someone who has less than perfect eyesight..

If anyone can help that would be great.

Cheers

Andrew