'53 3100 1/2 ton with a 12v conversion.

the truck currently has a 12v alternator from who know where, but it's not charging. i want to replace it with a 12v generator, but i can't find any place that sells it whole, every place i've looked has a 12v generator without the end plates. this wouldn't be an issue if i was directly replacing something i already had. any ideas?

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