I don't know of any, if you have a drill and a drummer it is easy enough to use an aero mount as a template and make your own though, I do all mine that way. Normally much lighter than comercial mounts too as you make it to suit your boat and don't need it to be adjustable.
I feel I should warn you away from 20mm motors though, while I haven't tried one in a boat myself I know several that have and the average quality of a 20mm motor is much lower than other sizes, and even those that bought high quality ones that on paper should have been very efficient at that power level have run very hot and slow compared to a short 28MM motor that doesn't weigh much more, and have ended up replacing them.
Paul Upton-Taylor, Greased Weasel Racing.
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