Oh, and I think I have those tabs Charles is talking about. I bought a TYGA tail from a friend then realised they didn't fit the 21 without those tabs, so I ordered a set from Tyga, but I never ended up putting them on (lazyness ) and I don't think they will ever be put on as I have gotten my hands on a GP Race Tail and subframe.
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Jerry Lai
NSR250 [MC21SP]