If the axles are 5mm (I presume they've already been upgraded) then any of Tamiyas modern buggy wheels will fit, such as the 2.2" Astral Dish, part number 51205 or the plain 2.2" dish wheels, number 51261. There are matching rears which will fit straight on the Ultimas hex drives.
The other way is to replace the uprights with Associated ones. By drilling out the Ultima uprights to 1/8" you can fit RC10 steering arms and axles in the C hubs so you can run RC10 wheels.
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