I believe the legislation already exists previously Part 74F or the
Trade Practices Act 1974 and now I think in Schedule 2 Clause 58 in the Competition and Consumer Act 2010.
However, they only have to make such
parts "... reasonably available for a reasonable period... " . This may well mean that they might only be available for the production life of the vehicles concerned and perhaps at $100 or more per bulletin. And of course they are required to advertise their availability or precise of contents.
I suspect they are listed in Fords online parts catalogue like the workshop manuals and your parts counter should be able to provide a list of bulletin numbers and prices (if not you could threaten them with the ACCC). I have previously gone down this path under the old WA Consumer protection Act to get a VCR service manual from a company but never tried it with Ford (and never needed to).
The definition of parts in that legislation included service and parts manuals but I haven't yet found in the overly long omnibus
Competition and Consumer Act 2010. searching the Act for "parts" just turns up 1001 references to parts of the Act so I lost interest. See
http://www.comlaw.gov.au/comlaw/comlaw.nsf/sh/homepage or
http://www.austlii.edu.au/ to search the legislation yourself or perhaps email the ACCC
http://www.accc.gov.au/content/index.phtml/itemId/142 with the question.