A friend has a 4 link with stock rear frame rails in a Duster and looking to add an anti roll bar. Any kits fit and/or perform better than another? Pics? Thanks!

Just make sure you buy one with steel weld on ends, not aluminum splined ends.

I agree. Here is mine under my 70 Challenger.

I've had zero problems with my S&W anti roll
bar which uses alum splined.. but its a race
only car.. it works great.. I just check each
year when checking all other moving parts to
see if its tight

I've used small ones and they work perfect but the big ones look sexier. But of course they cost more.

I also use the S&W one on my Duster, and its been great. I used to hate how the car launched...

The problem you may have is, most "kits" are made for narrowed cars....I do not believe any are wide enough for a stock width frame car...You may have to get a custom one for your width at a little extra cost.

Just make sure that the bushings that install in the tubes allow the assembly to move freely. Sometimes they need reaming.

The bushing thing is a good point. The bronze bushing SW ones are best in the middle price range to me. I drilled mine for a grease fitting, and cut a grease grove around the bushing intersecting with the fitting. When I shoot grease in it comes out all around the bushing.

S&W kit hear, with stock width frame. Works great and haven't had any problems with the arms. Mine just fits inside frame rails.

I used TRZ