I second (third?) the endorsement of Fastlane. I recently ordered a valve cover gasket that I found had a slight manufacturing defect so probably wouldn't seal properly. Phil had a new one in my hands in a day, no questions asked.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold