1959 Generator

[2001convertable]

I went to take my 1959 3100 235 engine on a five hour trip and got stuck. The generator pulley cracked causing the belt to brake off. I don't know if the unit seized and cause the pullet to crack.I have the unit on the bench and it spins freely. I had been smelling a burning smell for the past few weeks prior to this happening.Thought it was the exhaust wrap I put on the same time.I took the generator out and only found a few numbers embossed on it. they are m484, 985a, 887a and 11 84 a. I wanted to order another and don't know which number to use. The truck is a 1959 3100 with a 235 engine. thanks