I'm in a bind here.. I need to get a replacement u-joint for my POS junk tomorrow as I am running out of time to wrench on it before this weekends race.

The U-joint I have is a Spicer and is labelled SPR 539 right in the center.. I cant seem to find it, either on-line or in our local parts stores.. I orginallly got it from a driveshaft shop that custom made the the driveshaft and sold me the yoke that it would work with..

If anyone can cross reference this part number, I sure would appreciate it ..

Thanks in advance