Sea and Sea arm recommendation needed

First off, the Sea and Sea YP-D1 and their Grip Stay are the same prodcuts that Nikon is currently selling for their J-4 camera. Only $200 more! Imagine that!

I need an extension arm from the Grip Stay to the Strobe., Both of these units have the big round lug hole. Sea and Sea do not seem to offer an adapter for the round lug to the ball.

Photos attached. Any suggestions will be appreciated.

Never mind on this one Duplicate. Photos on the next one. Sorry for the duplicaiton.