To me, on my truck at least, the lines into the MC all look like 3/16 tube inverted flare. It is definitly NOT AN-3 fittings (they look like a flare....so not male threads on the nuts going into the MC).
The first kit won't work. The second link is what you want. The actual thread on those nuts are 3/8-24...so if you hold up a 3/8-24 bolt up and the threads look like they match, it is for sure a 3/16 tube inverted flare.