FX2021991n / a L3451991FW305YesPhysically mountable.No280 L3551985FW305YesPhysically mountable.No280 L3621988FW305YesPhysically mountableNo280 L363-16ohms1986FW305YesPhysically mountable. Impedance is different!No280 L363-8ohms1988FW305YesPhysically mountableNo280 ...