Everstart Group 41 always worked for me with an 02 2.5L in my 88 AT. A ground cable from the starter ground to the frame is recommended. See threads on theSamba. The 86-91 VW starter is just adequate. I went with a high torque Bosch starter from an 02 Jetta TDI manual diesel with the WestyVentures adapter.
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Edit: the WestyVentures adapter is now available from T3 Technique and also RMW(VanCafe)
