All 4 models are available for download on flightsim.com.
I've also prepared this guide to the various Fokker/Fairchild F.27 versions (AI models)
Fokker F.27 variants
Original fuselage, no weather radar (short nose)
Original fuselage, weather radar (long nose)
Original fuselage, weather radar (long nose), cargo door). These versions differ in their engines (different RR Dart version) and in the presence/absence of a reinforced cargo floor. From our perspective, they are visually identical. For repaints, use the Mk 200 model and choose the "cargo" layers in the paintkit.
Fuselage lengthened fore AND aft. Weather radar (long nose) and very wide cargo door.
Fairchild-Hiller F-27 variants
Similar to F.27 mk 200
Similar to F.27 mk 600
Fuselage lenghtened forward of the wings. Weather radar (long nose).