The RAM-202U consists of a C size 1.5" diameter rubber ball connected to a 2.5" diameter plate. This mount has the universal AMPS hole pattern.
RAM Mounts Universal Double Ball Mount with Two Round Plates
RAM Mounts Double Ball Mount with Two Round Plates
RAM Mounts RAM-GDS-CHARGE-V9U mobile device charger Universal Black. R
RAM Mounts RAM-GDS-DOCK-6G15P mobile device charger Mobile computer Bl
RAM Mounts RAM-201U-35 mounting kit
RAM Mounts Transducer Mount for Lowrance StructureScan with Socket Arm
