I could be wrong, but I don't think that is a 73 Dart wiper motor. (maybe a 73 2 speed)
My 73 Swinger has a different drive shaft that cambers off center when park engages.
That looks like it would work. I bought mine on line. They did say it would even though it was different. The one in my car was like yours. I guess I'll have to buy one like yours. Thanks for the heads up.
