After changing my motor mounts I tried to change the transmission mount. I can't get it off. The problem I have is the Flex Disk is in the way and I can't get any tools on the top nut of the mount. 1) What size is the nut? 2) How do I get it off with the Flex Disk in the way? The mount is falling apart so I have to change it. Car is up on jack stands so any quick advice would be great.

Chuck