I was doing some wrenching on the 1966 230S today and noticed the rubber
donuts at the sway bar ends have distorted more than I would expect in
10 years of occasional use with a couple stretches of daily driver
duty.

Does anybody know if there is a polyurethane or stiffer material
upgrade available? I suspect these are "generic" parts that can be
swapped over from some other make/model.

I would also guess that if I do all the rubber donuts in something
stiffer I should also do the rubbers where the sway bar mounts to the
frame.

Along the same lines - anybody know a thicker sway bar from another
model that will bolt up? I really prefer stiffer handling. My 190SL
has an upgraded sway bar that is 50% stiffer - helps a lot.