Thanks for your reply!
I cannot find them in the list of featured airplanes.
It is a pity, as they were very popular in the 1960s and 1970s among the US regional airlines and they lasted in service until the late 1980s.
Maybe this is another case that the game engine cannot handle?
I hope they will be included in future scenarios, togeter with other piston to turboprop conversions which were launched but were not commercially as successful (including maybe the DC-3 into the Basler BT-67...).
BTW, same for the freighter conversion of NAMC YS-11, which was used by Airborne Express and other parcel carriers.