Looking for a dovetail saddle which will accept #20 threaded rods

After years in its case I have re-mounted my Ceravolo 216 f/6 Mak-Newt.  Fabulous scope.  I want to hang my TV80 on top of it, as I did in 2006, but on a dovetail not a fixed attachment. That way I can swap with a small solar scope. Can anyone point me to a dovetail which will accept the 4 #20 screws that are on the rings of my Ceravolo?  See photos.

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Here's the rods in question

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Aluminum is pretty easy to work with.  You could just buy the dove tail you want and drill it yourself.  Regular steel bits for wood working will drill aluminum easily.

Thanks for a reasonable suggestion John