[HIGHWAY BY THE SEA]

Anyone know off of the top of their head what size nut attaches the wiper crank to the motor? I had mine in a box on the truck's flatbed with other parts, and when I left to get a drink then returned minutes later the box was on the ground with parts scattered everywhere (I suspect the cat). I found all the parts EXCEPT the wiper crank retention nut. Once I know the size I will get another from the hardware store.