The RAM-B-238U consists of a 1" diameter rubber ball connected at right angles to a 2.43" x 1.31" diamond base.
The base has two holes 1.912" from centre to centre, matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles.
The RAM-B-238U will attach to any RAM composite cradle. Many customers use the RAM-B-202U for the same purpose too.
(Product packaged in poly bag.)