Generator pulley

I want to post a wanted ad for a generator pulley.Are all not threaded 5/8 belt width pulleys the same.If not what years would I be looking for.I have a generator with a narrow pulley held on with the nut and lockwasher and want to replace it with a wide pulley.

Thanks in advance
Bill
 
Just to amplify what jimvette said: You have a narrow belt pulley. They only came on the 50-53 passenger flatheads. Assuming the one you have fits your armature shaft properly, then you need a 49 passenger or 48-53 commercial/truck pulley which is wide belt. All these are held on with a Woodruff key, lockwasher and nut.
 
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