I have the PACE MBT-250 but from some time ago with SX-65A hand piece. Does anyone know if the SX-70 heater will work in the SX-65A? They look the same. 5-lead, 3 hole mount, same tube attachment... The SX-65A has been discontinued and the heater is no longer available for it. Pace and Jensen could not answer the question. Thanks!