Pick-N-Pull or since you are going to have to pull the old one out anyway, make your own new one. I found that the most likely area is within 6" of the wheel end. Probe into the insulation of each wire and see if you can trace the break to either end as you progressively work toward the front of the car. It may not be as difficult as it seems and you can use Shoe Goo to cover the holes you made in the insulation. As I recall, there are two wires. Did you check each one individually to see if you have continuity on one and the other is broken?

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,