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it's just the reference number of the sprocket. if you look below that, it'll tell you the differences.
110 = 525 pitch
110A = 520 pitch
110K = 525 pitch PTFE coated
119 = 520 different design, but up to 74 teeth
120 = 525 differend design,(not listed) but i believe up to 74 tooth

the 251 series is actually the one for our bikes. 251A is the 520 for the 600RR.
if you have doubts, just give them a call. they are pretty decent people to deal with.
 
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