OEM - Piston Ring Set Kawasaki 82-85 JS550 Std. - 13003-3019. This ring was used on 1982 - 1985 JS440 (Std. Pistons 13001-3023). No longer available new from Kawasaki.
For those of you that do not know, ALL OEM Rings are sold individually and are for ONE Cylinder, so if you have a Single Cylinder 300 you need One Ring Set, if you have a Twin Cylinder engine then you will need 2 Ring Sets, if you have a Triple Cylinder engine then you will need 3 Ring Sets.