Hey, been digging around all over the internet, these forums, talking with some techs and owners and just haven't had any luck with this, so here I am.

I've been unable to source a bushing for one of the bolts that goes into the rear knuckle. It completely disintegrated upon removal, and I don't know how necessary the bushing is, or anyone even really discussing it in general. Bushing kits don't seem to ever mention the knuckle at all, and only refer to the control arms and DTSS, and none of the individual parts look like the correct one or the right fit.

Photos: Highlighted part goes into circled part. Held bolt is missing the bushing, goes into the spot being pointed at. Rear knuckle/hub on a 1990 FC Vert.

 

That is the DTSS bushing as far as I can tell. This aftermarket part is pretty rare. I believe as of not long ago there are some left in Japan.
As far as I know, the eliminator bushing is done most often. I did mine with the eliminator. I haven't drove the car yet to see the difference. Yours are so shot that your rear tires would wear out in no time flat probably.

 

If keeping the DTSS/AAS isn't a realistic option, I'm fine with losing it, honestly. I did look into it a bit more, and I think I found the right part from Mazdatrix and Racing Beat. Mazdatrix references the correct part number for the bolt, and Racing Beat's instructions point out the exact same spot, so I think I'm going to order the toe eliminator.

 

The stock toe control bushing is only available in Japan, and it is very expensive
https://www.amayama.com/en/part/mazda/fby126210

 

Wound up getting this sorted: For anyone who finds this in the future and is curious about the aftermarket solution:

https://mazdatrix.com/product/susp-t...6-92-all-pair/

https://www.racingbeat.com/RX7-1986-...nts/14050.html

Pick your supplier, it's the same part. Works perfectly, although the added stiffness is somewhat noticeable. But some people prefer the stiffness and predictability over the way the DTSS leans into things. Me, I kinda wish I'd sprung the extra couple hundred for the OEM part.

 

Thank you for the feedback. I always really enjoyed how the stock bushings were at the entry to corners. It's been a decade or more since I drove my S4 so it is likely I won't remember the difference after switching bushings.

I think that there are some more options for the bushing too. If I am not mistaken, there are all metal versions.