Thanks for ending the thread with a clear outcome, Rob. And good work on the mower - negotiating for transmission parts at that distance can be difficult, but it looks as if you got it right first try. Hopefully no other damage was done by the abuse that destroyed those two gears. Other than that, you've got a nice ride-on that hadn't done a lot of work before it was trashed by that hoon, so it should be a pleasure to use for a long time to come - and it looks good as well.
I'll close this thread. If anyone needs to post to it, just PM a moderator.