I bought one of these to replace the ugly bar mounted type. It's listed for a BMW but works fine with a 30mm thread lengh.
BMW SAT NAV MOUNT GPS 25mm 1" BALL - STAINLESS SUIT RAM MOUNT SOFT GRIP DESIGN | eBay
BMW SAT NAV MOUNT GPS 25mm 1" BALL - STAINLESS SUIT RAM MOUNT SOFT GRIP DESIGN | eBay