https://www.loweandyoung.com/buy-parts/KINZE-Part-GA5113-28T-SPRKT-147770/
KINZE Part # GA5113 28T SPRKT. Lowe & Young, Inc., Ohio
kinzepartloweyounginc
https://andover-norton.co.uk/nvt/triumph-motorcycle-parts-shop-details/21571
Andover Norton - G/box sprkt lock washer lrge - 57.2056
G/box sprkt lock washer lrge
andover nortong boxlock washer