Well, for me, having mud flaps is a must. A long, long, time ago. Back when I got my very first new car. It was winter time. After driving my new car for only about a month, I noticed that the tires were picking up the sand on the roads, and with it, "sand blasted" the paint off of my brand new rocker panels. Never again. So, ever since, the first day I get a new car, on go the mud flaps.

Personally, I like the molded ones over the flat ones. The flat ones look, and are, generic. The molded ones custom fit the contours of the fenders and look more like they belong there.

What I have found one, kind of answering my own original question, is that the MM and MMH, even with the Premium Pkg, don't have the soft trim around the wheel openings (sometimes called "fender flares") like the higher end FE and FEH with their Premium Pkg do. In other words, the MM and MMH are always equal to the base FE and base FEH in this regard. So, molded mud flaps designed for the base FE and base FEH fit the MM and MMH.

The one problem is, that they molded mud flaps say either "Ford" or "Escape" on them. Not too cool for a Mercury Mariner. However, I have since found that Husky makes a set of molded mud flaps for the FE and FEH, but without any logos. You just need to order the ones for the base FE, without the "wheel lip molding or fender flares".