Are washers and spacers basically the same thing but just come in different thicknesses? Or is there some fundamental difference?
Yes, they are similar! A hole surrounded by material. It’s very important that the inside diameter be less than the outside diameter, or they become illegal 
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Our favorite supplier of legal washers and spacers is robosource.net with an impressive variety and low prices, most of all, reasonable shipping charges!
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Thanks very much!!! Really appreciate it.