250-500cc Odometer speedometer drive

Ive got a 1994 wxc250 im trying to add an odometer to. Im trying to fit one of the original setups and scored a NOS kit from a 2001 that is in the mail on the way to me. I am now realizing that my axle is a smaller diameter and i am probably going to need a 92/93/94 odometer drive to fit the smaller axle/bearings. Is this correct?
If so, is there anyone that has one to sell or trade for the 2001 version i am getting?

From what i understand, the rest of the parts in the kit should work for me...cable, odometer, dometer mount etc

Thanks for the help
Patrick