the rtr as far as I'm aware comes with the original dimec chassis which Durango did away with as it was weak and broke lots.
It's +8mm longer than the standard alloy chassis that comes in the kit version of the 210
the only direct replacement would be the Dimec 20 Spec B which is also a plastic chassis but with less flex.
The Spec B correct the weakness from the original dimec and dimec 20 but requires additional spec B parts such as the front bulkhead and rear toe blocks.
There is a +11 alloy chassis from RDRP but your looking at a cost of roughly £90 for that
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