driveshaft info / parts needed

[dixchief]

trying to finish my 63. the motor/tranny was pulled at the engine rebuild shop years ago. i got it back minus the tranny cross member (found one since0 

now i need the driveshaft. I have a drive shaft that I THINK belongs. 3" diameter. end U eye to end U eye is approx 46". Is this the right shaft?

can't find the tranny (auto) splined end for the shaft. need help finding this. easier to buy one than hunt endlessly for original.

TIA

Richard

[64studeavanti]

According to workshop manual, aytomatic driveshaft is 46 9/32 long with 2 3/4 diameter. 4spd is 51 29/32 and 3 1/4.