Yes, both upper and lower, and the spring pad also. New shocks come with upper and lower mounts, so you might want to consider replacing the shocks.

 

 

I think just about everyone sticks with the OEM Bilsteins, which are very reasonably priced through many of the online suppliers.

 

 

When I was under my XJR for the rear shocks I found the sway bar bushings had failed as well as few other rubber parts. These will give you clunks as well.
They're easy to check and replace (much easier than anything else on the rear end, IMHO)...

 

Although I would bet on shock mounts, there are rubber donuts that hold the tailpipe in place; if these go you will hear a hammering. There are also zerk (grease) fittings on the output shafts from the differential that may need greasing.

Try some rubber lube or silicon spray on the the rear shock mounts: if that quiets things somewhat, you have found the culprit.

 

 

I did that pushing up/down on the trunk-no noise at all-when we got the shocks out yesterday the bushing were shot. I got poly. bushings from Motorcars ltd. in Houston $150.00 worth the extra money. Car now rides like it is 1999. Don't forget to also order/replace the coil spring isolator,