The wheels should be orange.  The same as the frame stripe on a Hart Parr 70, which is the same as A/C orange.  Most if not all of the parts that you asked for are available from Korves Oliver.  <!-- w --><a class="postlink" href="http://www.korvesoliver.com">www.korvesoliver.com</a><!-- w -->.
Sorry that I don't have any pictures of a Cockshutt 80 to send.  All of the 80s that I have had use the same throttle set up, but the earlier 18-28s and 18-27s used a fixed governor rather than a variable speed governor, which would have used a different control linkage.  I hope this helps, Terry.