As written by my favorite GM suspension lunatic before the flood, the one and only Herb Adams: GM was terrified of law suits after Nader, especially on the suspension topic, so the mandate came down from on high: Oversteer is banished, even power on over steer is to be blunted by every means; our wonderful line of GM vehicles will henceforth understeer, a lot if at all possible, at least a little always. So was born the imperative for A- and B- and G- and D (you get the idea) bodies FRONT sway bars shall be of more roll resistance than REAR bars. Among other unfortunate choices. Oh, by the way, thinking about leaving out some front body bushing? OK if understeer is increased. Maybe a nice big heavier engine in your A-body. Give me that old time understeer. Old Herb thinks Hey! THere's a dumb idea I can play with. Maybe I can pump up the roll resistance on an F-body front bar, sure FEELS cool and flat, it might make people think it handles better too. Brass doesn't worry about bigger front bars. So then I can build up the rear one too ( WARNING!!) and what about that GTO? Hysterical conversation with GM brass ensues and flash forward until B-body production is ending and at least an 1/8" delta between F+R solid oem sway bars still holds. FE1, FE3 any and all different without a distinction WX3, 9C1. After market didn't fix it either, pointless jumbo front bars with the same roll resistance as smaller bars, the goofy delta F+R in roll resistance preserved. Finally I'm told someone makes a set of 1 1/4" F+R after market bars that finally incline (God only knows what springs some people have mucking up the works) toward neutral. So trust me (I'm not like the others. You can trust ME!) the OEM mandated and blindly mimicked by the after market delta in roll resistance deserved to die, long ago. So I wrote for the SVI cars 22 years ago and even here at least 15 years ago and as antediluvian as my advice is, everyone on this site will benefit from it: Any mix and match of sway bars that have the same roll resistance is the way to go. 1 1/16" solids F+R? yes. 1 1/4" solids F+R? yes...Same diameter F+R solids is the most obvious, but the Hellwig 1 3/8" hollow front has the same resistance as the generic 1 1/4" solid front and the 1 1/4" solid rear or the "new style" Hotchkis 1 3/8" hollow rear. Flame away only in contradiction to reality.