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The parts prefix 55N indicates that this graphic kit belongs exclusively to the 1985 Yamaha RZ50 sports motorcycle. [1]

Specifically, it is tied to the 5R2 chassis family variant of this high-revving, liquid-cooled 50cc two-stroke machine. [1]

Decal Kit Details

Placement: The code 28301 means this graphic set specifically wraps around the bike's lower leg shield/lower engine cowling covers.
Aesthetics: The terminal color designation (-10) matches the factory accent striping designed to accent the 1985 model's base paint options (typically vintage Chappy Red or Clean White color schemes). [1]