Years ago Ben Staub made the very best reproduction of the original Model A Service Bulletins. Every once in a while they show up on ebay. I bought a set about 15 years ago. These are a bit high, but if you want the best, here is a set now on ebay.
http://www.ebay.com/itm/122544820814...MakeTrack=true
http://www.ebay.com/itm/122544820814...MakeTrack=true
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