Here is one I made up for my older Polaris mount so the top needed to be a bit different to what you want but no reason why it couldn't be kept flush for your purpose but you will see that the bottom plate is center bolted to allow for major rotational alignment and leveling is also done on the bottom plate.
For my purposes the upper plate also allowed the mount to be adjusted for fine Polar tuning.
Worked really well. Bolts could be as short or as long as needed.
Nico.
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