Which axis? If I remember tight they have different number of teeth, at least mine does but that one has one original Nylon and one in Stainless, a replacement ?

Tell us how may teeth and the OD and i see what i can come up with.
My nylon one isn't great and I have a pair of 2mm pitch timing pulleys for the replacement but it's a rework job and not 10 minutes.

BTW mine was working fine but I gutted it and put Mach3 on it, still have all the original circuit boards etc, - just couldn't be arsed learning an obsolete controller.