I can't help with the photo because I've not owned my car from new, but I can help with the suggestion that perhaps the Brooklands series of road tests on the cars might help ? They don't scan so well but with an original you might be able to make out enough detail to get an idea.
Brian
(I've bought them all over the years, the best in terms of reproduction is probably the latest one, "Lotus Europa Gold Portfolio" which I think also includes some of the articles that appeared in earlier issues)