[Mike Drew]

Somewhere on this forum there's a specific reference for the original quad taillights which were used on all the GT40s for the first couple of years. I think they are fairly generic Lucas items, and are probably easily available if you know where to look. Starting in 1967 the later dual taillights were used; some early cars were modified with later bodywork (and thus the later lights) while others retained their original setups

Note that the Mk II cars used quad taillights which were completely different from the Mk 1 versions.

Personally I love the early look!