Front hood

None of the early cars. Looks to be stock for the GT5/GT5S and beyond cars.

From '75 and up.

Thanks for the information. Guess a lot of owners cut their hoods.

I almost see all cars before 75 with them? Are they all added later?

I read somewhere that American Mercury dealers almost systematically added them to "improve" cooling, which explains why many models before 1975 are equipped with them.
Someone who had the opportunity to talk to Tom Tjaarda about it assured me that from an aesthetic point of view he was against this modification, especially because the grilles are flat while the hood is curved in both planes.
After all, aesthetics is a personal point of view.

@Zofix posted:

I almost see all cars before 75 with them? Are they all added later?

It was a popular modification. I don't know of any US delivered cars that were factory equipped with them.

European cars might have been since DT would build the car anyway that you wanted it.