I was asked to clean the carburetors on a friends 2002 Vmax 600 ER. I got them apart and found that the number 1 float needle where the tab slides on the float tang was broken off. Actually, it looked like it was dissolved because it was eaten in a few places and was laying in the bowl. Yamaha lists 2 part numbers for the viton-tipped needles. 1AE-14190-13-00 and 1AE-14190-12-00. How do I know which one I need and what is the difference? Thanks!