Hi, was looking into getting my block heater working. And after finding out all 98-99s had the heater plug installed, and finding the part #600-200-00-96 to the cable. I call my local dealer and I learn the part in no longer available. What can I do? Are their any other options to use in it's place?

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1980 240D(the first, 4spd)
1983 300D(WVO experiment) gave to my brother
1987 300D(sold with 360k+ miles on original #14 head)
1999 E300D 225k miles and counting