Here is a series of photos showing how one R107 owner replaced the soft top.
http://picasaweb.google.com/Rivermaster/1983380SL1?authkey=fgbNxZrraQc#5188477853397373906
http://picasaweb.google.com/Rivermaster/1983380SL1?authkey=fgbNxZrraQc#5188477853397373906