They are all the same now, Honda have done away with A, B, C etc. Tyga is the best bet for you, I live in the UK so distance is not an issue for you!!!

Here is a link to them, the price is per set for one piston. I assume you need them for a NSR.

http://tyga-performance.com/site/product_info.php?products_id=175&osCsid=0fc65f04db44d1cdaa9111497ba79446
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NSR250R MC21 (NEARLY SOLD!!)
VFR400R NC30 (SOLD)
Santa, please bring me a NSR500 and a SP-2 next year. Pleeeeease....