Does anyone know where i could find a Mauser Geha Extractor???

No, but I have the blueprint for a 12 ga one if it helps. I actually need a couple myself but it's a little beyond my machining ability. Or you can tig weld a 98 extractor and fit it, which is the route I'll probably take.
-Don

Don let me know how that works out.

The prototype worked out ok except for my crappy welding. It was time consuming to fit it. Which makes me think that you might be able to refit the one you already have. If it isn't grabbing the casing hard enough you can dress down the part that rides it the extractor groove to allow the whole extractor to move in closer. But you might have to also fit the part that grabs the bolt head. I'm not an expert and just trim a little and check about a hundred times untill it works. I had to make a new bolt head and firing pin also. I still have to finish fitting the pin.
-Don