Pentax 67 with polaroid back

I'm a professional photographer based in London and shoot on a Pentax 67 my Pentax with a polaroid back has broken, I want to convert that camera back so I have a spare.

So my question is does anyone have a Pentax 67 with Polaroid back which is collecting dust they don't use anymore or know of someone that would be interested in selling one, I've been looking on ebay for a while but have not had any luck

Thanks for any help!!!

Simon