I ran one size on my Command 20; Motorcraft FL400 or the Napa, Carquest and Supertech equivalent. Currently have a ST3600 on my Kohler Courage 20 twin. Same basic block dimensions as the Command. You do not have to worry about exotic or hard to find sizes for these engines. FL400/ST3600 is all you need and is the largest, safe/comfortable fit.
2014 Subaru XV Crosstek 2.0L, 5spd, 2013 Dodge Grand Caravan SE (Babe magnet III)