I am about 90% finished with one for my 300D ( I lost my window of opportunity to finish/install when the starter crapped out just before my wife left for an overseas trip). It's really not that hard and no special tools are needed (however, it helps to be inventive ). The great thing about doing it yourself is then you are sure that you have installed parts that are going to last for years rather than junk that will make the thing slide past the short warranty.

Rick

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)