72 Demon Driveshaft

Odd combo needs a drive shaft. For a 72 Demon/Sport 8.25 to Slant Six 904 it measures out 50.25" tight cl to cl on the yokes something a little less should work
I could'nt find a size for this combo on the lists, but did see 70/72 Duster/Sport 8.25 to 318, 727 which is 49.95 cl to cl
which should work. I don't think I want to go more, but a little less would work too.
Close to NJ 08244
Thanks