You might want to post a few pictures of the magazine... more often than not, something else will also fit in it.
He might want to contact Tradeex... they have a few listed... maybe they have spare magazines
Somewhere,probably over on the Swedish Commercial board at gunboards,I remember seeing one of the Remington mags could be made to work. It was a 51X magazine.
Start with a Remington 511 mag. I have done a few using black acraglas and they work fine.
The metal ones are very close to the original Husqvarna repeater magazines.



























