Endlinks are universal, in terms of fitting any diameter sway bar. (They're specific to the application -- that is, front of a Legacy GT -- but it doesn't matter how fat the sway bar is, as long as the link is strong enough.) The endlink just transmits force from the suspension to the sway bar and vice versa. You should not notice any change in handling from changing them out, unless your current ones are bent or broken.
Originally Posted by instantfury
hmm gotcha. if i do go aftermarket endlinks w stock sway, will i have to get new endlinks when i do get a bigger sway, or are they "universal" cause im not seeing diff sizes or anything like that for an upgraded sway. so i shouldnt have any diff handling characteristics by only changing out the front? once again, thanks