KX250 Clutch

I am in search of a 99 kx250 stock clutch basket, or "clutch housing assembly" as the parts diagrams call it. I notice that when you look at hinson parts they list their clutch basket as working on years 92-01 or something like that. However when I start looking at parts diagrams to check this, they have different part numbers for almost every year of bike between 92-01. I guess I need to know what years of stock clutch baskets can be interchanged, and why they have all the different part numbers if the part is the same? Thanks for the help, mod edit: this part should be in the wanted/for sale forum

Thanks for the leads. Sorry about throwin that last part in there, i'll post seperately next time.