steering column coupler

Can anyone help. I am trying to find a steering column coupler with no success.
As far as I know it is a stock box. I have counted and recounted the splines and come up with 3/4 shaft 35 splines and a gap. This is on a 64 dart GT. Used to be a slant 6 car. The new column is 3/4 moly tubing. Any help greatly appreciated.:banghead: