Am about to reinstall the motor into my "50 F-1 and have question on the engine mounts, (see pics), I have the whole mount apparatus but my question is when I set the engine onto the mount assembly do I use the bottom metal circular piece under the mount or do I need to get several big washers to bolt to the bottom to hold it in place?

What goes under this when the mount bracket is on top to hold it from sliding off the mount