NEU, I've been in touch with Will via PM about this, and I've been working on some alternatives to the factory bushings. Using the information Will had posted, I gathered up all the necessary poly, and pressed out all the OE bushings. More importantly, I have the subframe and upper control arms at my machinist's shop and he plans to do some kind of Delrin bushing with steel inserts to replace bushings #2 and #3. ASFAIK, the upper control arm is just a pivot point, and doesn't experience any lateral forces, so Delrin with steel inserts to serve as mounting points for the control arm. I'm pretty sure the mystery bushing where bolt #14 goes through is this one: https://www.fcpeuro.com/products/volvo-control-arm-bushing-rear-lower-9490797 I ordered two, and did some measuring. There's a slight difference in the center steel insert length... 2mm. Luckily, that difference is on the short side, where the bolt enters the bushing. The bushing itself is slightly different in length, but that shouldn't be a problem either, as it can be driven into the LCA to a point where it correctly attaches to the control arm stay. Will has suggested that this mystery bushing be replaced with either poly or something else. My concern is that this bushing DOES receive lateral forces and so whatever replaces it has to be strong enough to handle that. This MIGHT be a good place for some kind of spherical bearing, though wear might be an issue if all it sees is lateral force. I'm going to look into some kind of poly replacement, but not having any kind of catalog that shows bushing dimensions is going to make that like searching for a needle in a haystack. My other concern is that poly tends to "hog out" quicker than rubber when subjected to lateral forces. All I can say on this one is "stay tuned". If I can figure out how to post pictures to this revamped forum, I'll post up some pics I've been taking of the progress.