The Mamiya TLRs have two sets of bellows. The outer bellows are rectangular and enclose the viewing and taking lenses. Inside there is a square bellows for just the taking lens.

A scrap TLR would be a good bellows donor. I have one here. It wouldn't be worth posting the whole body to you but if I can work out how to remove them, I could send the inner bellows to you.


Steve.