Michael, don't feel too badly, I thought the same thing until I investigated as you did. At least you have an idea of what the connection is SUPPOSED to look like. I posted proudly until Matt G. pointed out I had it all wrong: no swivel/plate in the front. I must have installed my crank shaft three times before I got it right.
By-the-way, now is a good time to check and/or replace the swivel connection at the rear of the tractor (most of mine was missing). Also, be sure the drive shaft is straight and that the hydro fan is all there and working. Finally, check the flex disks for wear and use fresh locking nuts to bolt it all together.
My two cents.