Not sure if @slingmods posted this yet and I didn't see it when doing a search.
Polaris Slingshot Double Din Stereo Dash Mounting Kit by Scosche Industries
I like that it angles the head unit to a better location and has a small sun visor. I'm tempted to rip my custom set up apart and try it out once Slingmods gets it in stock. However I would lose the water resistance of the the current set up. Hmmm.....