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I don't know of anyone who sells rubber bushings, I wanted them in the front "A" arms and rear trailing links for my '86 street driven car so they wouldn't squeak. Here's what I did after I installed the poly ones and got sick of the squeaking:
I replaced the entire trailing link set (4) in the rear with an OEM set from MAD or CCentral (I don't remember which) They were having a special on them and the cost was pretty reasonable, I thought. The poly ones were squeaking where they bolt to the car body, which is not too far away from your ears. Even gobs of the special sticky, nasty grease they give you to put on during installation didn't really help. The OEM ones work great, no squeaking.
In the front, I kept the poly bushings but drilled holes in the "A" arms at the bushing locations and installed Zerk fittings. This can even be done with the "A" arms installed on the car. After using my grease gun and regular grease, the problem disappeared and now I have NO squeaking.
I have poly bushings on my sway bars, and with the special grease I have had no squeaking from them.
If you mean the rear trailing arms, yes. I'm sure the front "A" arms do too, but you can bet they want an insane amount of $$$ for those if you can even get them for an early C4.
one more question...did you look at installing zerks into the trailing arms as you had done with the front control arms? would they fit w/o interfering with the range of motion?
That's a good question. I suppose you could put the zerk fittings on the trailing arms as well - I would think there would be enough room for the range of travel too. :)