Sorry, meant to answer this last night but it slipped my mind.

http://www.polymotion.com/

They're up in Concord

I'd go with the oil impregnated bronze busings. If you ask nice for some "samples" you might get some for free (the usually deal with large orders)

No specs online, but I think I have a catalog at home, so I could give you a part number if you give me measurements.