Rhino imported the 504 and 554 from the Shanghai factory in China. I believe it is one of the better Rhino models. Lots of features: 55 HP, power assist steering, 4x4, diff lock, disc brakes, canopy ROPS, suspension seat, live PTO, equipped with a US made Koyker loader.
Although parts are only available through one U.S. company---Farm Boys. They have had every part I needed in stock.