A plurality of interface modules (200,300,400,500) having identical first mating interfaces (202,302) for mating with the mating face (100) of a cable tap connector (10), to enable interconnection therewith at second mating interfaces by different types of electrical conductors. A set of contacts in each module have identical first contact sections (212,318) along the first mating interface, and the contacts are secured in the module housing (206,306) under an insulative retention plate (210,360) that assuredly secures the contacts in proper position for accurate positioning of the first contact sections. The insulative plate (210,360) also protects the first contact sections during handling of the module.