Hi Brett, I call MCI Kentucky tech support, they are great with help, one person in particular, is knowledgeable about older Series MCIs. Don Foley in old parts, is very knowledgeable and a nice guy, willing to answer your questions. As opposed to a parts guy in MCI Los Alamitos, CA who told me my MCI TMC 102C3 couldn't be, because TMCs only existed in 5s and 7s! lvmci...