Primary Gears for a Black Cat.

[BlackCat50]

Does anyone know the part number of any overdrive gears that will fit a Black Cat? I was wrongly told by someone that rides a Zuma that those will fit, but they won't. I tried some Athena PN 071415 primary gears but the spline was a coarse spline where the Black Cat is a finer spline. If the part number is not known, how about a dealer that you have gotten them from?

I don't even feel like trying to get this info from my dealer as they only like to work on stock bikes.