I saw the one on Springer for the regular SP01 dovetail, but I didn't see one for the Shadow. It was specific that it would not fit on a Shadow. I sent an email to Henning a few minutes ago.
Ha! Just found one on Cajun Gun Works, $50.
Scratch that, won't fit a Shadow.
CZC is out of stock on a multi optic Shadow mount, but it is $84.