About this 3D model
I made a spacer for the iPhone5 Car Cradle ( http://www.thingiverse.com/thing:30510 ). This space will fit a RAM Base w/ ball ( http://www.rammount.com/CatalogResults/PartDetails/tabid/63/partid/082065077045065045050051056085/Default.aspx ). This spacer would work for anything you want to add a RAM mount to as long as it's big enough to glue.