This Eaton Fuller 5566507-BOX Double Row Ball Bearing is a new old stock (NOS) heavy-duty commercial truck transmission part. This Eaton Fuller bearing directly replaces Koyo 83C062D, making it an ideal choice for various transmission bearing applications. Designed for demanding heavy-duty applications, this 5566507-BOX bearing functions as a critical mainshaft bearing or countershaft bearing in Eaton Fuller Roadranger transmissions. This Item May Interchange With The Following: 5566507-BOX