Contact R/C stock car donuts seem the be the tyre to use these days. Tyres are 36mm wide so you will need two sets to mount up for a buggy. Kamtec sell UFRA 70mm wide on road donuts but a pair of them are more expensive than two pairs of stock car donuts.
I've probably got suitable spare tyres kicking around, I can dig them out if you want to see what I have.
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