FRPGUY,
Reproduction of these parts would be cost prohibitive to most kit car builders as manufacturers will not set up for small runs. I have made the enquiries.
If scratch builders want to build a more authentic car then I am afraid they should have done their research beforehand and make the abortive calls like the rest of us because there is no magic wand.
Recently a couple of carpetbaggers were naive enough to contact a mate of mine for all the part numbers, drawings and sources in his collection which took him fourteen years to attain. As if he would just roll over ?.
Frankly "money does not always talk" and these calls only made this collector more insular. Try getting a set of original chassis drawings - it's just the same.
So, you are correct that most chaps are secretive about their sources and I can appreciate this as it does take an age and a lot of blind alleys to find the correct part numbers and locate them and that effort greatly outweighs any single value of these often simple items.
However, as I wrote previously the resource pool for these parts in fine condition is extremely small and placing them correctly into an original GT40 often increases the originality and hence obviously the value of the car in question.
Consider spending eighteen months looking for an overpriced $30 plastic light fitting and working out a value when somebody asks you if you are selling it. This why I personally don't sell parts.
So now, you have them in the pictures, you now know what they look like, but with respect to other collectors, you still have to do the digging.