125cc rear shock replacement help

[taiil0r]

Hey guys.. my friends son (9 year old) has started to become a little rider and he broken his rear shock. I really need help figuring out which one is the right one to buy. I have attached pics of what ATV he has and the shock that broke. I grew up a rider and when I saw how much he loved it, it kinda melted my heart haha. I wanna order the part and fix it for him so he can get back to doing what a kid should be doing and staying off that damn xbox!!