Hey T,
I have been running on the KYBs on all corners for a couple of years now and couldn't be happier. I'm not lowered but several guys run them on lowered setups with no problems. You can read Lantana's comments about them here:

https://www.crossfireforum.org/forum...ew-shocks.html

KYB Gas-A-Just Monotubes - Front part# KG4731 and Rear part# KG4732

You can find them @ Rock Auto for around $55 ea. fronts & $63 ea. rears.
You may also still find them on Ebay, where I found mine.
Just search under the 2001 SLK320 to find them.

Also...Summit has them for $57.07 ea rears.

http://www.summitracing.com/parts/KYB-KG4732/

These are a great upgrade from the OEM Sachs twin-tubes.

Here's the specs for the rears....
Adjustable: No
Body Diameter: 39.2 mm
Body End Type: See Upper mount/Lower mount
Body Material : Steel
Boot Included: No
Bushing Color: Black
Bushing Material: Rubber
Coil Over Springs Included: No
Collapsed Length: 15.28 in
Color/Finish: White or silver paint
Diameter: 39.2 mm
Dust Shield: Yes
Extended Length: 18.9 in
Gas Charged: Yes
Hardware Included: Yes
Internal Design: Monotube
Line Fitting Quantity: 0
Lower Mount Type: E2(10x40)
Lower Mount: E2(10x40)
Mounting Bracket(s) Included: No
Mounting Hardware Included: Yes
Shock Type: Performance Monotube
Travel Distance: 3.62 in
Type: Performance montube
Upper Mount : S1
Valving Selection Quantity: 0