The FRPP ones should be updated premium low-friction units.
Yes....MFE is once again correct. I had this exact same issue with my '93 LX. Conventional wisdom told me to lift the wheels off of the ground, jack under the control arm, and then try to wiggle the tire to check for ball joint slack. I had zero wiggle. But when changing lanes, it did not return to center...similar to a steering box that is adjusted too tight. So anyway later on I put new balljoints in just for the challenge....cause I've never done them before on a fox body. I got them in but let me tell you it's not that much fun. The control arm is more or less just sheet metal, so you can't just press it out and the new ones in as easily as other vehicles (trucks). Anyway, I got them in and the car drove 1000x better, like it should. Bad part is, the control arm bushings were junk, worn out, garbage. Car drove ok but I could see the bushing sag when I jacked the car up. So ok, ordered new poly bushings and installed them. What a pain! They are NOT easy to put in, again just sheet metal, so you have to usually cut the old ones out with a sawzall or hack saw blade, then press the new ones in-but pressing them into sheet metal is challenging to say the least. I drove it several years like that, then the ball joints began to seize again. Ok, so let's put some new low-friction joints in. They FELL into the holes that they are supposed to be PRESSED into. The control arm swells when you press new ones in, as usually new ones are slightly larger and it appears to me that some are larger than others. Only choice I had was to tack weld them so they wouldn't fall out.
If I had to do it all over again, I'd replace the control arms as a set, complete-and be done with it. Once you figure in the cost of the replacement joints, and consider that once they're installed, the control arms could very well be junk from that point on, then the cost of the worn out bushing replacement, that $250 is a pretty good value, IMO. I'd like to put some new arms on mine but I'm stuck at whether to put stock style arms on or do the K and tube arms while the car is in a million pieces. May end up being a money issue, or lack of it. These things get expensive quick.