Difficult to find correct tyres these days as most WGT tyres come premounted.
There are still several different tyres available that will fit, a foam tyre is still a foam tyre even though they aren't labelled as for a specific type of car. The
RC4Less dirt oval donuts will fit, 40mm wide and in a selection of compounds. Tyres for 1/8th stock cars are the same size, available from
Contact.
Corally still sell their Pro10 tyres as donuts, but you will have to get Modeltech to import them for you or buy them from
Germany or the
Corally themselves in the Netherlands where Pro10 is still popular.