Dodgeman.....great question, when all else fails go to the markings on the items. The switches had no markings/manufacturer name, but, the relays did. The relays for my low voltage lighting system are made by Remcon(R)..Amprobe Instruments(R), a Division of Core Industries Inc, Lynbrook, New York 11563 (Phone 516-593-5600). The internet gave me a distributor which handles Amprobe Instrument products here in Michigan. Their on-line (old) catalog lists accessories and replacements; included are the gangable momentary contact switches I was looking for. Thanks for the shove in the right direction.