The part # is slightly different (you did not mention what year , so I just went with 06 , but I am guessing they are the same) , I don't know what the physical difference would be , as the parts that attach are all the same , so I can't see the pedal itself being physically unable to bolt up , the only thing I could possibly think might be different is the distance the clutch cover sticks out from the frame between the 250 and 450 , but I can't see that being a issue
1
46510-KSC-305 PEDAL, RR. BRAKE 82.49 82.49 * *
1
46510-MEY-305 PEDAL, RR. BRAKE 83.99 83.99 * *
**It says Superseded Part # for both these numbers**
Maybe look up both models for your specific year ,to see if the numbers are the same as what I posted
http://fiche.worldofpowersports.com/yel ... lYear=2006