sorry for the typo on my list o' parts i gave ya. yes its 36mm. i carry mine in the glove box;) (not really)  
your balljoints should not give out on a stock XJ in a year.  possible. maybe.  National should fix it under warrenty right?
if not, ask to borrow a tool. i borrowed Doms, had it done over thanksgiving (-15. bleck)  but its straight forward actually.