These are wear items. I found a UK supplier that makes better bushings.
Upper and lower bushings for our Aluminum control arm.
4 x OE lower bushing is #3530223 (rubber)
4 x OE upper bushing is #1205991 (rubber)
SuperFlex has polyurethane version. They also have sway bar bushing
of various diameters. Measure your front bar and select the correct one.
I am also look at them for replacement Bump Stop. These are the large
rubber fixture on the inside of the rear hub.
Price is very close to OE Volvo rubber, so this is a no brainer to go
polyurethane.
http://www.superflex.co.uk/products.php?cat=420