The non-NB vendors seem to have a blind spot for 2005 SLK 55's.
Ain’t that the truth!
This message is neither spam nor a recommendation or endorsement for newparts.com, but an example of the pricing for the specially cast “PVT-vented” Brembo 340mm rotors:
Front Disc Brake Rotor Brembo part number 09.9254.33
Aluminum Hat & Special Cast Iron Braking Surface
$265.95 EACH (sales rep I talked to yesterday said I could knock about $28 off each rotor, which would make a pair of these Brembo replacements about $476.00, which is still a pretty stiff price. Checked a couple other sites, and Brembo part number 09.9254.33 IS (AFAICT) the 340mm diameter for 6-pot front pistons (though Amazon, as usual, has next to Brembo part number 09.9254.33, a picture of a solid, one-piece rotor which is god knows what). The specs, however, are correct:
Your Selected Vehicle:
Mercedes-Benz SLK55 AMG 2005
This product fits this position on your 2005 Mercedes-Benz SLK55 AMG:
Notes: Composite/Floating: Floating, Min TH (Discs)/Max Diameter (Drums) (mm): 30, Nominal Thickness (mm): 32, Outside Diameter (mm): 340, EXCEPT Performance Package [Code 030 or P30]
RE: the “Special Cast Iron Braking Surface (slk55-amg-front-left-or-right-disc-brake-rotor-vented-pvt”) [I wish I knew how to post a photo here, but since my ancient standby “Photobucket” seems to have died, and Apple has made Dropbox useless, except for copy-and-paste, if you want to see the pictures, including the PVT (Pillar Venting Technology) cutaway, you’ll have to go to the URL]. The “Pillar Venting Technology” allows the rotors to fit either left or right side. Instead of the cast internal rotor vents being direction-specific curving left-or-right parallel arc diverters, the PVT “heat flow diverters” are multi-shaped-and-placed and bi-directional.
Still wish I could find something considerably less expensive for rotors.