Yes Mad Rat wheels are a direct fit and the correct width as per the manufacturers design hence why is my preferred choice. It also looks stunning and the wheels are designed better so are less prone to buckle / bend on impact.
I would recomend buying the Kamtec ZXS shell as it comes with an undertray. At the moment the only avalable under tray is made in Canada and its flimsy and gets damaged far too easily. The Kamtec ZXS shell is a tight fit with a little mod to the servo (buy the servo attachment arms for the B4 so you bolt the servo to that with the extender as well to push further into the chassis and would recommend a kimbrough large servo saver for protection as your daughter will be driving it) the shell will fit. You will need to work out how to cut it as the lines will be for a ZXS and not the ZX/ZXR
Spares, you can buy belts on ebay worldwide from a German company, they are not as good as the originals so you will have to replace more than the originals but still work reasonably well. Chassis, top deck, motor plate, servo plate, L brace, steering plate and shock towers can be bought from fibrelyte in carbon fibre.
Ujs can be bought but will be ZX-5 versions however a couple of pages at the end of the ZXR thread the part numbers are posted there.
Hope this helps.
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