You’d also need to know the number of teeth on your drive gear (on the output shaft inside the tail). You should be able to remove the driven gear housing and will be able to see what color it is but I’ve seen a few variations as in, the same number of teeth being two different colors. You could raise the rear axle and spin the tires to turn the output shaft and count the number of teeth.
Lastly, this kit come with several driven gears you could easily swap out till you get one that works for you.
https://www.ebay.com/itm/13265705988...mis&media=COPY