Bill,
That is a question that Cal Metal or Jim Maxwell could probably answer for you. I have seen them with both types but I am not sure some of them came from Shelby that way. I think the first ones that I saw that I actually knew came from SAI with the
oil cooler were AN fittings but I can't even remember that for sure. I know a lot of people added
oil coolers after buying the cars and some used different types. Sorry I can't be of more help.
Ron