I hadn't seen that. Some movement is normal for re-centering, but it sounds like you had too much. I have seen people use stainless steel hose clamps as stops, though, on other cars.

I like the idea of greasable ones with poly bushings, because they get noisy when they get dry. I had them (front and rear) on my last car and had to pull them off to grease them. Doing that every 5 or 6 months gets old.

 

I design bushings for Moog, Napa, Autozone, etc..

Bear in mind a couple of things-

1) A sway bar without side stops will move if the bushings are too loose. Many manufacturers use rubber so tight it actually provides spring stiffness from the lack of movement (or, they put a flat on the bar with a rectangular bushing hole so the rubber flexes but there is no slipping)
2) Unless you take right turns all day, the sway bar should center itself, as the axial loads it sees from the ball joint-style link shouldn't be significant enough to severely move it.
3) Greasable bushings don't mean a thing- we have tested our thermoplastic bushings up to well over a million cycles at heavier loads than a car sees, without failure, without grease.
4) A sway bar without a ring in the bushing or a stop ring outside is usually bent so that it can only slide so much before it hits said bend.

I personally haven't installed our bushings on my sway bar yet but I will in the spring, most likely. Mine squeek when they are cold but thats it. Our bench testing shows that thermoplastic, though stiffer than rubber, should be a good replacement. It will make the whole system stiffer though.

 

wow nice price $15.00 to 16.00 $ for the pair but $23.50 to ship to Canada , I'll check my local parts places for a price up here