65 valiant steering coupler for power steering.

I purchased everything I needed to add power steering for me 65 valiant from an auto wrecker. The steering coupler they supplied is about 5/8th of an inch longer than the standard steering one that the car had. Because I also have the automatic this makes it a very tight fit. Is there a coupler that is the same length as the standard? If so where can I get one? I would just need the lower part as the top and insides from the old one will work.