Hi Nick,
The wheels are all different, the G I spent hours getting the wheels of are different to the Y22 that I had the wheel off because I had to split the cases so I could replace the "O" ring on the gear selector shaft. That one I had the box out and I hammered on the end of the shaft with a brass drift and eventually got it off. I did replace the gearbox housing on an R36 rideon but it was some years ago and I can't remember how I got those wheels off but because I can't remember they must have come off without too much trouble.
I tried the local bearing place for the seals but they didn't list anything close so I typed into ebay the size I wanted and just went through till I found the size I wanted. Because I was looking for seals for a G built in the early sixties they were obviously an imperial seal so I had to go for the closest metric one I could find
