CAV ZF speed sensor replacement

I am working on a members CAV GT-40 that is equipped with a ZF transaxle. When the right rear inboard axle joint snapped, the speed sensor was hit and broken. I am now looking for a replacement sensor but cannot seem to find one. It is a 3-wire(black, blue & brown) unit with a threaded body(3/4" x 2-1/2"). Overall length of the sensor and wire is 33". If anyone knows of a source for this sensor It would be greatly appreciated.

Thanks,

Dan