i know its not a 66
but

I put a plain roll pan on my 51, had to space it out 1/2'' so my added lights & wiring would clear the bed flat metal.
i added two sets of plain round clearance lights,
the license sits dead center and flips up (hinged to a frame) and the hole allows me to crank down the rear under bed spare tyre.

http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=10A.jpg

http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=2A.jpg

http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=20A.jpg

http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=DSC00499_0001.jpg

Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe
Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE