I'm trying to find out if these parts are compatible. As usual, parts are listed to fit the E24 in general and then other sites suggest it's the earlier >83 models only. I've cross referenced the parts on real OEM, for the E24 the bushing is 333290619946 for the non eccentric bushings, for the E30 the number is the same EXCEPT the last 6 is a 5!
Now, the poly I've found is adjustable and lists it covering both the E30 and E24 (including, but not specified to 83> ).... here...
PFR5-306G Powerflex Rear Trailing Arm Bushes Adjustable Purple Series (4 in Box) | eBay
It may well be a case of suck it and see, but at £150 its an expensive humbug... Any more info anyone has stashed away would be great to hear!