tensioner spring crf50

[HONDA18]

Hi everyone, I need a new cam chain tensioner spring for my crf50. I found 2 on classic honda 50's Australia but i'm not sure which one is for my bike, it says to match up the part number to my bike but im not sure how to match it up, can anyone please help?

 

[Gerro]

http://www.classichonda50saustralia.com.au/store/index.php?_a=viewProd&productId=850

Would be the one mate.

 

[HONDA18]

cheers bud