Don't know the answer
I copied someone else on the mount and have an oil cooler shutter sandwiched against the top side. It leaves room to work on the left magneto for removal, adjusting timing, etc. Heavy aluminum angle bracket bolted into the top edge of the redder peddle well. Here in the northwest during most of the year the oil temp can be adjusted above and below the Lycoming specification. Attaching to the back of the baffle is a clean install too, and probably the same amount of work. Sorry for out of focus - these are the best log images I have.