Calumet C1 parts?

[ilewando]

Hello,
New here... I am a C1 user, purchased mine on Craigslist and refurbished (new bellows and glass and seeking out extra lens boards). I've not been able to find a couple nonessential parts, namely the rail's front locks and knobs. I'm also seeking a 5x7 reducing back (I only have 8x10 and 4x5 but curious about trying out 5x7). If anyone has any resource or leads on these parts?
Thank you!
Ian

 

[juan]

On my former C1, I replaced parts like those with things I found at the local hardware store. The camera uses regular American threads, so the parts may have looked a little different, but they were functional.