Ebay seems to be the best source. Just look for calipers that look similar to mine and then check the Brembo site and enter the aplication that the ebay ad mentions. for example if you find some listed for a CLK500, enter that into the berembo site searching for front rotors for a CLK500 and then click on the right year/application and you will see an engineered drawing of the rotor meant for that car. In the case of the CLK500 you find that the rotor is the same part number listed for the C32 which is 345mm in diameter. Mainly what you want is to find a caliper that wil work with either a 330 or 345mm rotor. No matter what you find on Ebay, check the brembo site to verify if it will work with the intended rotors.

http://www.brembo.com/ENG/catalogo_AM/2007/index.html

Here are some:

http://cgi.ebay.com/ebaymotors/Bremb...Q5fAccessories