I think they are known as Kiev 88 and there are a couple of user
groups, you may want to google the name and browse for info or posts
for tips, if the backs seem to be usable as they are for your project.

--- In cameramakers@yahoogroups.com, "Ted" <tedburford@...> wrote:
>
> Thanks for the tip. I went to the local camera repairman and got 2
> Russian Hasselblad backs for $5.00.
>
> Ted
>
> > Look for a Hasselblad at a flea market or thriftstore, I find
parts
> > from those to usualy work well, fixed my Holga.
>