I didn't get the whole kit, just the bushings that attach the axle to the trailing arms.

See FCP Groton here:

http://www.fcpgroton.com/volvo240rearsuspension.htm

See part number SPF1312K for $55.67. It's pricey but worth not having to wrestle with removing the old bushing sleeves, even with a tool. The original style bushing can be had for $24 but it'll be more of a hassle to replace. Many on the board have done it that way though, and claim it's not extremely difficult.

First unbolt the rear of the trailing arms from the rear axle. If the bushing is really shot, most of the rubber can be removed by hand. If it's still relatively intact, you'll have to drill out the rubber as much as you can, then use a small propane torch to burn the rest of the rubber out. It will ignite easily, and after it softens up you can push it out with a large screwdriver or other tool.

Now you just have the outer sleeve left in the axle, and you can use an inexpensive small wire wheel to clean out the inside of the outer sleeve. I had to use a 90-degree drill attachment because the exhaust can get in the way on one side. Then you just grease and slide in the two-piece bushing, half from each side of the outer sleeve. Just bolt it back together and you're done.

Polyurethane is stiffer than stock rubber, which is why they are used in performance applications to maintain suspension geometry under load, but I don't notice a harsh ride. I never drove it with anything else but the bushings that were shot and allowed clunking and rear-end movement which made the car feel unstable.

Some of the other suspension bushings will require you to remove the trailing arms and track rod to have those bushings pressed in by a shop with a press, unless you have a good press of your own. Good luck!