Airbox Lid (RD250 & 400) – Part No 1A0-14412-00. Airbox Top Section which is the Air Cleaner Case (RD250 & 400) Part No 1A0-14411-00. Airbox back section (RD250 & 400) Part No 1A0-14441-00. I have taken the airbox apart and gone through the constituent parts, checked them to make sure there are no lugs or nozzles snapped or missing and I have given them a clean, so they are ready for the new owner.