cav speedo sender

can someone tell me where i can get a new speedometer signal transmitter for my 2002 cav mono? i have the original VDO speedo and transmitter that came with the car, had speedo and transmitter tested, speedo still good, transmitter bad, this is the unit that picks up a signal at the 6 cv bolts holding the cv to the output flange on the transaxle, any and all help greatly appreciated, Neville in New York, ____ [email protected] or 631-603-6744, thanks.