The broken bracket on the left is welded on the frame, and the mount is bolted on the engine with 2 allen bolts. It's what i see on AC part's diagram too.
I know how it mounts I have the same set up. Im saying the actual mount inside your bracket. The circle mount doesnt look like the stock mounts I have seen. The mount usually looks like the mounts on the pto side of your sled.
I just put an engine back in a sled for a customer. He replaced his rear mount with a solid dampener like that. One ride he brought it back with coolant leak. Its possible so I looked and looked finally cleaned everything up waited for it to dry put coolant in it and find that the mount had cracked the bulk head and the cooler was leaking. So I am welding the bulk head going to replace mount with new mount. One that mounts to top of engine.
Get a hold of Arctic edge Brent Linderman he has some for the M8 in stock.
Like arctic2009 said, i think now that this is not AC mount. The dealer put this one on warranty! I've checked the other mount and they really not like this one. The rubber looks like the one in your link mmsport.(really nice mount!)
I'll be set maybe tomorrow, my baby is at this other dealer near home and he's checking if it's the right parts number...
Looks like a snopro mount. They have 2 durometers. I put the softer one in mine about 7-800 mi. Ago. Vibrates like hell at an idle but gave me my 300 rpms back.