Definitely not a dealer option. Our GT6 was purchased by my father-in-law from the factory in 1967. They completed the car and sent it to a dealer in London where he picked the car up as soon as it was ready.
Doug L.
--Previous Message-- : For some time I've wondered what that : spacer was for... and only one. It : appears to have been milled-out, not : solid. Mine too is on the drivers side. : Dealer Option? Anyone? :