Part Number: 104-203 (Outside mic. w. interchangeable ) Part Number: 10-4203-002 (Oval head brass semi-tubular i/) Part Number: 10-4203-003 (Oval head brass semi-tubular i/) Part Number: 10-4203-004 (Oval head brass semi-tubular i/) Part Number: 10-4203-005 (Oval head brass semi-tubular i/) Part Number: 10-4203-006 (Oval head brass semi-tubular i/) Part Number: 10-4203-007 (Oval head brass semi-tubular i/) Part Number: 10-4203-008 (Oval head brass semi-tubular i/) Part Number: 10-4203-009 (Oval head brass semi-tubular i/) Part Number: 104203-01 (Channel assy) Part Number: 10-4203-010 (Oval head brass semi-tubular i/) Part Number: 10-4203-011 (Oval head brass semi-tubular i/) Part Number: 10-4203-014 (Oval head brass semi-tubular i/) Part Number: 104203-015 (No description)