Johnny joints size?

[shocktech4]

im thinking about getting some control arms built for my cutlass.. i decided to go with johnny joints over heim joints...this is abit lazy of me. my car is being stored on the other side of town. so im unable to measure the stock size arm to find out what size i will need.. they come in 2.63" and 3" joints.. ive been checking out Ballistic fab. but there is a local supplier that has other sizes to.. anyone know off hand what size will be needed? i kinda remember the measurement of 2. 5/8ths.. which is damn close to 2.63'


this is what im prob going with
http://www.ballisticfabrication.com/For ... _1636.html