Fan Pulley for Ford Lynx. Part no.10130.
As circled in RED.
The Ford Lynx has a 12volt electrical system and the generator has an unusual pulley. It screws onto the shaft (20tpi) and is held on by a cir-clip type of fitting. Most Ford of WWII are 6 volt (but not the Lynx which is 12 volt) and slide onto the shaft and have a keyway and held in place by a nut.
Measurements are shown on the attachment. Drawing not to scale.
Old age has caused the original to shatter into many bits.
Thanks Rick