Welcome to the forum fella.
It seems these things are pretty tough to come by. I've been after one for a while now but haven't had any luck at all. When they do turn up they can fetch pretty good money. I assume you're after the standard 3/8 in and out? Some have a larger input - I think from the Case marketed mogs but not sure?
If I come across anything I'll let you know. Likewise if you happen to stumble across two (we'll be lucky!) then let me know because I'll have the other one! They can be bought new, but you don't get much change from £1k.