Actually, there are three different beds in the years 55 through 66 and they won't interchange without modifications. Lots of subtle differences from 54 to 87. Our article on bedside interchangeability covers many of the things that changed over the years. On our website go to
http://www.mar-k.com/installation_hints.html and scroll down to "Bed Installation" and select "Bed Side Interchangeability" for more details.
Mar-Ktech
