Bolt-on Bases
Simple bolt down bases in a variety of sizes form the basic RAM mount. The -238U and -202U bases are also used for attaching cradles to your mounting system.
Round, diamond and rectangular mounting bases are available in most RAM Ball sizes - for instance there is a RAM-B-202U (B series), RAM-202U (C series), RAM-D-202U (D Series) and RAM-E-202U (E series).
Beacuse they have so may possible applications most RAM bases do not come with mounting hardware - so you will need the screws or bolts for your particular application.
Attach to anything featuring the industry standard AMPS hole pattern or drill holes in your device cradle to suit.
Wikipedia has some good information on VESA mounting patterns
The AMPs hole pattern consists of four (4) holes located in a rectangular pattern spaced at 30mm x 38mm (1.181” x 1.496”). In some cases the AMPS pattern consists of multiple holes, allowing the
mount to be fitted in both a horizontal or vertical orientation.
Some of these bases such as the RAM-B-252U and RAM-B-272U are perfect for attaching cameras to poles, walls, fairings or under existing bolts or studs.