Hi,

The slk32amg is in the front as well as in the back standard fitted with two dot rubber spring pad. So changing to a lower pad will not change much, as you can imagine. In the back you donot need a spring compressor, in the front it is better to use the compressor. Perhaps these links will help:
for the front axle:
Spring and Pad removal Front - Benzworld.org - Mercedes-Benz Discussion Forum
for the rear axle:
https://www.crossfireforum.org/forum...ictures-4.html
Furthermore you have to realise that B&G springs, according to their info, only sells springs for the 200/230 and 320 slk. This doesnot ! include the 260kw 32amg compressor engine with a single weight of appr. 905 kilo. In fact here in Europe the Eibach prokit is not advised for the slk32amg, just check their site einbach.com. Both are for European standards to soft.
My advice (sorry) would be: AMG springs, front axle: MB part nr. A1703210104 rear axle: A1703240104, or to cut the oem springs, both will lead to same effective result, depending how much coil you cut of course.
I hope this will be of any assistance to you