I've seen post that say that some gears wont fit the bottom shaft on the F7. I have a 99 ZR with 20/39 I was going to try in my F7. I have the snopro and i'm running 107 to 109 in good cond with stock set. We have a up hill drag race coming next sat so no time to order. Will the 99 gears fit thank's for any info.