Fastlane at the top of the page usually stocks them. I checked now and they seem to only have the Wahler now. You could give them a call and see if they will get any in stock any time soon. I also believe that the thermostat you get from the dealer is a Behr, but I could be wrong.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record