If you are going cheap, I sucessfully fixed mine (which had that same plastic part broken) with a small hose clamp, and so far it has held on for six months with no further problems. Good writeup, though.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro