Try cornucopia Enterprises, they have a lot of unsorted A7 gearbox parts. I got a good C10 pinion from them and they are on the endangered list. I had a C10 quadrant that was completely stripped, built the teeth back up using a tig welder and stainless rod and filed back to shape, works perfectly, I dont see any reason why the same couldnt be done to the pinion as a last resort just a bit time consuming, I dont see that the mesh has to be perfect as its only about a third turn.
