ball joints ?

[sideways180]

i already have all the spindle's and knuckles off a 95 SE to put on my 91 base model 240.  i keep hearing you have to change the balljoints to the s14 style.  how hard is this to do?  i am probably going to just purchase new control arms with the whiteline bushings from PDM racing unless someone else knows of a better place to get them.  does anyone know if they can sell s13 control arms with s14 balljoints in them?

--jason
91 base 240 waiting for DET
98 ITR