Hi Nick,
I feel your pain, I had to replace the seals on a G22 and I am still waiting on the seals to arrive from China, my usual supplier doesn't list them or even close. I had a hell of a time getting the wheels off to get to the seals. I don't know how many seals they fitted but when I removed the seal there was another one behind it, not sure but there might be another one behind that as well. I'm just replacing the outer one when they arrive. I have had the wheels off a Y560 and they were hard to remove but I had that gearbox out on the bench and I was able to punch them out with a brass drift but it was hard going. I didn't bother checking how many seals were fitted to that one
