Okay, a coupla tips... See if you can find a phone no. for a Birchwood Motors, I think in Winnepeg. I've been told they're a BMW dealership with a good parts inventory. Next, when BMW sold the 524tD here, they had a block heater for it, part no. possibly being 12 81 2 24 1 002. How adaptable this is to the M50 I don't know. Last, try an Internet(s) search using "block heater""BMW" and you may come up with something.