Maynard,

I have one.  Pearson original part, light wear.  With bolt and somewhat worn side plates.

Jon Simpson 

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Pretty sure they are 3 1/4 by 1/2. 

Try McMaster and Carr but you'll need to get a 3/4 to 1/2 bronze bushing.  With it. I might have one if you'd like for

Me to look in my parts supply. 

Zeke. 

We haven't had to buy that part ourselves. Looks like Harken has some. Maybe one will do the jo bnicely? https://www.harken.com/en/shop/sheaves/