A sample from the products for the F-18 include: Screw,pan 5x17, Rubber,packing Pr (nas), Nut,(hex) Cap 6mm, Muffler Comp,exh.
This schematic depicts all components used in the Scr100wh 2007 (7) Japan Fj13-120 F-18 partslist.
With a quantity of two pieces, the Rubber,packing Pr (nas) is the most used part in the F-18 diagram.