Correct color for Tonneau On BN-2

["Allen C Miller, Jr." <acmiller@mhcable.com>]

For what it may be worth, I just acquired an absolutely pristine, original 
'56 tonneau (black), and can supply some subtle detail differences between 
it, and the  1970's tonneau that came with the M, and with the current 
after-market tonneau (blue, and good match for the Healey Blue kit from 
Heritage). The fasteners, zipper and finish are quite different