SB Motor Mount Bolt

[Bram]

Ok everyone, I need some help.
Here is the problem, I have the small block motor mounts mounted on the engine right, well my problem is the single bolt that goes up through the middle of the tower into the motor mount, (By the way this is a 72 4x4). I need to know the length of the bolt and any other hardware that goes with it, lock washer ...etc?
The problem is I can't find the original hardware I pulled out, since I cleaned out my shed, so I’m relying on my memory which is gone. The tower hole where the bolt goes is pretty large, and I can't remember if there was a rubber piece or just a washer, or what?
Can anyone help me out, it sure would be appreciated.