They are called 'Winterfronts'
I have not found one made for the Commander but they are available for the GC.
I keep forgetting to measure a GC grill, but I suspect it may be close enouph.
Company that makes them is up in Canada......Phia or Phila....maybe Fila, or Fia or something like that.....we use them on my sons fleet of diesel trucks.
If we don't, the fuel gels in the extreme cold and they quit running or won't go above 40 mph due to fuel flow restriction.
I do sometimes wish I had one on the Commander.....they do make for a quicker warmup and with the only incoming air below the bumper I am confident the cooling would still be satisfactory......as far as mileage....I can't imagine a gasoline engine experiencing any benifit....my opinion.
The Winterfronts come with a patented, plastic snap that has 3M tape on the backside and they simply stick to the grill.
The Winterfront, in turn, snaps onto those snaps, so, when removed the snaps remain.
Although visible, I don't find them objectionable.