there are quite a few variants on the basic Skan principle.
I have a mk1 and had a mk2 as well as some of the later models.
I think you need a picture or two to help people identify the specific model and suggest what might fit.

A fill adapter is something that can be turned up by a machinist if not easily available.....a magazine might be trickier...

It will certainly be worth sorting out parts for as these are collectable and interesting niche pcp. breaking for parts would be almost criminal!!