If you get a suzue hub, it will need to be spaced but the axle is plenty long enough.
You will have some trouble finding track hubs that are 32 hole.
I like Surly track cogs and lock rings. I would also go ahead and get a nice, heavy duty chain ring.
If one of your old hubs is freewheel you can respace it(to get the cog in the right spot) and build it up for fixed, a track cog will spin on and you can use a english BB lockring for a cog lockring
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I am in the woods and I have gone crazy.