sprocket for cv joint bolt

I'm getting out my cv joint but i dont have the good sprocket what is the size of sprocket do i need?

thanks

Sprocket???

Uhhh.... the nut at the end of the cv shaft holding it in place is 30mm. Other than needed to know that, and the bolts holding the strut to the A-arm are 18mm... Nothing else its holding them in place except tight fitment.