Magic Speedometer cable

Hello, I need a new speedometer cable for a 1975 88". I have ordered many different ones but nobody seems to know the type . It has a forked end on the transfer case side where the speedometer drive connects to it . Please have a look at the picture of the speedometer drive shaft. P/N is NOT: RTC3484 or 90623054

Any suggestions?? Thanks!!

its not pt number 623055 either

Thanks. Just hoping that someone recognizes this cable.

Cheers

Martin