Parn, Monga Intacta is not the name of the critter. Read the text on that site.

I figure they mean some sort of Australian opossum for the fly. There are more than a dozen species of "ringtailed opossum". Not sure as to the legal status of the critter, but in the US, ringtails apparently can be trapped in some states and furs are available: http://www.hideandfur.com/inventory/7290.html

Hide and Fur also has Australian opossum furs, no photo though, at http://www.hideandfur.com/inventory/7230.html