Why does it need to be replaced, does it have an internal or external leak?

Although Fastlane may not have it listed in the online catalog, try giving Phil a call at the Fastlane phone number and he may be able to get the part for you at cheaper price. It probably shouldn't be a terribly difficult DIY job.

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Ali Al-Chalabi

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