461S1200 M12 Spring Washer Stainless Steel JIS
Made in Japan.
d=ID 12.2mm +0.5
D=OD 21.1mm -0.5
Thickness 2.5mm
Max Thickness 5.9mm 
Kawasaki part number is for reference only, 
this is a Genuine JIS washer from our supplier in Japan.
Ideal replacement to the original
Equivalent to Kawasaki Part 461S1200