I have had the type that is installed on the 5th wheel pin, it's a white teflon or nylon disc about a quarter inch thick or slightly less, available at most decent RV suppliers - coincidentally, just replaced the nearly 20 year old original with a new one a couple of weeks ago - the old one was getting a bit dog eared after the years and 80-90K miles...
They work beautifully, require no grease - which is a plus if you sometimes brush against the 5er hitch with clothing you'd really rather not have grease stained! Obviously, someone hauling commercially would need one permanently installed on the 5er hitch instead - and that's probably what was referred to with the "orange" bit.