Oh, wow. Lots of good advice here I checked with edmund scientific, but their mirrors seem to be a bit too small for my needs. My mirror is aproximately 46x57x1.6mm (only had a tape measure at hand). A couple of other places i checked had larger mirrors, but they were also thicker. I'll shop around a bit and see if i can find something to cut down or maybe better, drop a few lines to this cupog guy.
EDIT: oh, and i almost forgot.. It would be nice to have it identified uncle goose. I don't have my digi here atm though, but from looking at cupog's ebay store it looks identical to the type IIa, with one exception. the one pictured there doesn't seem to have a self timer lever mine has. It is situated on the right hand side (when facing the lenses) of the lower lens.