97 cr250r needle question

Why is the needle numbers in my owner's manuall have a two letter suffex? R1369MS, R1370MS, and R1368MS for example. Everything I read tells me there is only one letter after the four numerical descriptors except for the Honda manual & they give no explanation on what or why there is an (MS) at the end of the needle number. Ultimately, I am trying to figure out what number Sudco needles match up to these needles. Any help would be appreciated. 

The conversion for the stock R-1369ms oem Honda jet is a CEK sudco jet. The Sudco CEx series needle jets match up to you optional 97' oem needles.

Edited by rtv

Thanks rtv.....I've got one on the way. :ride: 

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