ADA-S3Seaview's innovative new modular electronic mounts feature a unique universal plate design that provides a cleaner look and greater installation flexibility. A pre-drilled anodized aluminum plate is incased inside the UV stable white ABS plastic. There are dimple holes on the top surface of the top plate match up with a drill template allowing you to precisely drill the appropriate holes for your specific radar. The end result is a nice clean look with no unwanted visible holes.This modular Top Plate fits:Glomex 20"-27" Satdomes (for modular parts ending in M2)Intellian i1 (for modular parts ending in M2) / i2 (for modular parts ending in M2)KVH M1 (for modular parts ending in M2)Thrane & Thrane Sailor FB500 (for modular parts ending in M2) / Fleet 55+ (for modular parts ending in M2)Raymarine 33STV (for modular parts ending in M2)VDO Ocean Line 132 (for modular parts ending in M2).