The two holes have two long bolts that have springs on them and these are attached to a metal plate that was drilled and tapped for two spark plugs. I have an NOS plate, and there was enough left of my originals to see how it was attached. This way, the spark plugs were allowed to float if you will to protect them from breakage. If anyone needs a photo, I can e on to you so you can see how it is set up. I used a piece of canvas and a thin layer of foam to make up the rub strip.
John
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