Every site I look at says this is the pilot for my FCR carb. http://www.rockymountainatvmc.com/p/44/54/213/930/2288/24375/Pro-X-N424-21-Series-Keihin-Pilot-Jet- So I bought a pack of 4. However, when I went to replace it, this pilot in the next link is actually the type in the carb. The above will not fit. http://www.rockymountainatvmc.com/p/43/-/213/930/-/30579/Keihin-N424-25B-Series-Pilot-Jet Can someone tell me why that is?