In addition to what Jason mentioned - though I admit I'm just speculating here: As some people used to have trouble with the gear diff not fitting in the casing, I think they may also have adressed that too.
All Type B parts I believe will be for the DEX210V2. The gear casing should fit the 210 without buying any other of the Type B parts. The Moulded Tub requires more other parts to make a complete conversion - I haven't looked into it entirely, but you'll at least need other suspension hangers and a different bumper in RM.
The silicone O-rings I'd say are different grades of rubber, they should allow different friction (and sealing) levels for the shocks. The 3mm ones will fit in the 1/10th scale shocks, the 4mm ones I guess are 1/8th scale?
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