When I was researching the Mercedes parts-bin bolt-ons some time ago using the early SLK55 AMG brakes was one of the possibilities I considered. I say early bcuz these came on ALL 05-06 SLK55 AMGs but only with the Performance Package thereafter. 2007-2010 SLK55 AMGs (unless they have the Performance package) reverted to the same brakes used on the C32 AMG both front & rear. If you want the brakes shown in your link here is all the data I collected on them at the time including the (Mercedes) part numbers. Spacers are for use with Xfire wheels.

(6-piston front, 4-piston rear)
FRONT: 360mm discs aluminum hat/iron rotor, 6-piston calipers 30/34/38mm
REAR: 330mm discs, 4-piston calipers 28/26mm
Brakes from:
MERCEDES-BENZ CLK63 AMG 2007-2008
MERCEDES-BENZ CLK55 AMG 2005-2006
MERCEDES-BENZ SLK55 AMG 2005-2010 WITH PERFORMANCE PACKAGE

CLK63 030 AMG BRAKES KIT:
003-420-67-83 (Caliper) Front Left
003-420-68-83 (Caliper) Front Right
004-420-50-20 (Brake Pad) Front
209-421-01-12 (Brake Disc) x2 Front 360mm
003-420-29-83 (Caliper) Rear Left
003-420-30-83 (Caliper) Rear Right
004-420-49-20 (Brake Pad) Rear
171-423-02-12 (Brake Disc) x2 Rear 330mm
171-540-06-17 Front Brake Sensor
211-540-17-17 Rear Brake Sensor
Ichiba MB-50310S-125 Version I Wheel Spacer (5X112 10mm)