The RAP-B-238 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 center to center, matches the industry standard AMPS...
The RAM-B-107U-238 consists of a double socket arm, diamond base and connecting Humminbird/Apelco marine base. Designed into the mount is a 1" diameter patented rubber ball and socket system with...