Parts such as the Muffler: Bolt,flange,dr,8x, Washer,plain,10mm, Collar,rr.cover, Screw-washer 6x12 are included in the Trx250x Fourtrax 250x 1991 (m) Usa Muffler parts fiche.
The component with the lowest price in the MUFFLER schematic is the Bolt-washer,6x12.
With two applications this Packing,protector (nas) is the most specified part.
