The adjustable tops can be found here: TYGA Performance TYLY-1038 (I won't link to the gawdy blue/red versions!)

The "bolt" (the outer part of the fork top) is the same part number between NC30 and MC21, but obviously the adjuster is part of the damper/cartridge assembly. However, if I really had to take a bet on it, I'd guess the NC30 adjuster is just as useless as the MC21 unit, and therefore likely [relatively] interchangeable. I imagine the only thing different will probably be the adjuster needle profile, but given that OEMs [at least back then] don't want you to adjust the suspension outside of a rather controlled range, it won't make much of a difference.
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Andy.
NSR-WORLD.COM

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