Hi Paul
I'm using VHM NF5 pistons ( from SP125) and i supplied the centre seal. It is a T2 racing one that i bought from Japan along with genuine outer seals also purchased from japan. I do not know where they sourced the bearings from but it is fitted with a standard MC18 bearing on the RH side rather than the NF5 one with the seal built in.
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NSR250 MC18 SP, KR1S, TZR250 3MA, RGV250 VJ22P