Others will come along and confirm but I believe there are two Pulley Belt sizes. 5/8" and 1/2"?
My 50' has the generator not alternator and 5/8" v-belt.
Here is a picture of mine.
What size belt pulley do you have?
What Alternator set up?
Attachments
20220903_142715.jpg (116.63 KB, 132 downloads)

Last edited by Shaffer's1950; 09/03/2022 9:32 PM.
1950 Chevy 3100