I'm no gear head, nor would I even classify myself as an off roader. Had a 1997 Jeep tj since I was 16, open diffs, 4 cyl, small body lift with 30 in. tires. Meets all my requirements as capable 4x4 here in Puerto Rico (i.e. diving in the sand, sketchy mountain roads which are mostly paved, farm roads, etc...). With that said I am very interested in the new Bronco, my wife might say obsessed. In pouring through specs and threads here I have come across some discussion of the M190 and M210. Is the M210 available as a stand alone option or only available with the Sasquatch package? If available standalone does it require a locker? Perhaps, its too early too know? Can anyone with the knowledge explain the major differences (i.e. I've read the 190 is aluminum and the 210 is steel)? Thanks in advance.