Part Number: 129-420052-5 (Intercostal) Part Number: 129-420052-9 (Channel) Part Number: 129-420053-1 (Splice-inner-fwd cabin fuselage-) Part Number: 129-420053-3 (Splice-outer-fwd cabin fuselage-) Part Number: 129-420054-3 (Web-floorboard-flight compartmen) Part Number: 129-420055-1 (Brace-support-flight compartment) Part Number: 129-420056-1 (Brace) Part Number: 129-420057-3 (Brace) Part Number: 129-420057-4 (Brace) Part Number: 129-420058-5 (Support-r/h-flight compartment f) Part Number: 129-420058-7 (Support-l/h-flight compartment f) Part Number: 129-420059-11 (Stiffener-l/h-bulkhead assy-f.s.) Part Number: 129-420059-12 (Stiffener-r/h-bulkhead assy-f.s.) Part Number: 129-420059-13 (Clip)