I also received my order or Rover Pro-Cut wheels today.
The two front wheels are pretty self-explanatory and relatively easy to find. The geared rear wheels are much harder to find. To my surprise, they are actually still available from Rover. I think what happens with these is that they are not generally stocked by retailers because of how specific they are and how much they cost. Having a set of these sitting on the shelf indefinitely would be a foolish game to play. As such, searching for these via part numbers alone yielded only one hit, and they were listed as special order. Reaching out to my previous Rover contact and the same applied. So, I ordered two sets!
If you will remember, despite replacing the drive cogs, I gained back then lost two-wheel drive, so the unit was single pegging and pulling to the left. When I pulled the wheels, one was engaging, and one wasn't. As soon as I opened the box, I knew what the problem was, the new wheels not spinning withing the "tyre" so to speak, meaning the left wheel had failed internally and was free spinning rather than engaging with the cog.
So, the unit will be pulled apart again and hopefully this puts things right. Having said that, with how the new Victa Commercial is performing, I think I may have found its replacement.