For MM3 you do not need anything extra bar two screws for MM4 you will need one pair of bearings (plus other bits) traxxas blue rubber sealed twin pack £3.49 modelsport and seem to be good quality they do there own brand no seal and are little cheaper but DO NOT go for them as they are crap in my opinion. You do know that those are the spur gear shaft bearings you refer to because if your going MM4 its the idler bearings you need.
Dave.
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CAT L1
B6.1D
Dex 210
FTX Vantage
Cen FF.NT
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