I've only had my jeep a little longer than you, but when you take off the hard top to put on the soft top, there are some plastic frame thingies that you have to install that goes around your rear doors and across the top of the front doors. I don't remember what they're called and the manual/DVD doesn't mention them. They should have come with the soft top. Anyway, those have that latch you're talking about. As for installing them, I think they are labeled with letters or something, but it's pretty easy to figure out. There are 6 screws, 3 for each side, to bolt them in place.
I'm sure there's someone here with more experience that can explain them better. I've only put them on the one time.