torsion bar seals

These seals are at the back of the bar and should NOT be in polyurethane. They are an oil seal anyway. From what I understand, the grease that's put in back there at the factory (and should be maintained if the bar is removed/reinstalled) is there for a reason. I recall reading an article about a '57 Fury that unexpectedly went out of control driving down the freeway. When the investigators started looking for problems, they discovered a broken torsion bar that was broken at the rear of the bar, not in the middle as most seem to do. Looking farther, they discovered that there was no assembly grease where the bar indexed with the rear anchor. The lack of grease had let moisture attack the bar and it was basically crystalized back there. I read that in a car magazine back in the 1970s, but don't recall just which one (possibly Motor Trend). When the bar snaps, it lets that side of the car suddenly drop to the suspension system's bumpers, which can cause a situation where the driver is startled and can loose control of the vehicle.

As for interchangeability, most of the torsion bars are in the 1" diameter range, whether for a C-body, Imperial, or other similar Chrysler product. About mid-way from the front of the bar is a stepped area (where the special tool for removing torsion bars is clamped onto the bar) and it's highly possible that all of the bars are the same diameter rearward of that area. Those seals should be available in the aftermarket through NAPA or similar--of course, you'll have to find someone that knows what a torsion bar is first. They might also be available through Chrysler too.