Ok, I got the "thin" or "regular" mounts in from S&P. There don't appear to be any dimensional differences between them and the Energy Suspension mounts. The "regular" type just have the back plate molded into the rubber as a single piece, but after several measurements, they appear to be the same dimensionally.
I guess my only option is to use the Energy Suspension mounts and leave the back compression plate off. Hopefully this will mate up and not shorten the life of the mount. I don't really see how it would shorten the life since it's mated to the adapter plate though. I just foresee a slightly different loading on the rubber part of the mount, since the rubber will be flush with the adapter plate instead of the wedged back plate being present.
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