Hi Anthony.
Grahams are the only MZ Skorpion, MZ1000, RT125. four stroke part supplier’s outside Germany.
But the Skorpion has only two parts that I can think of that are only available from MZ, the Air Filter, & Rubber Swing Arm Chain Guard, most plastics I would think are now unobtainable new.
The rest of the bike is made from Yamaha (engine, swing arm,) and Italian parts, (Forks, Brakes, Wheels), so parts can be obtained anywhere, ebay.
A Useful forum.
http://www.mzriders.com/viewforum.php?f=23&sid=80227c8205bd751dc7e72a7821cc8c22
Hope this helps.
Brian.