a quick change is required for this
http://imcdb.org/vehicle.php?id=346974
on IMCDB seems they are listed with Kässbohrer front
http://imcdb.org/vehicles_make-Kässbohrer_model-PistenBully.html
so correct model designation would be Kässbohrer PistenBully PB 300
a bit strange really cos Smart is owned by Mercedes yet isn't listed Mercedes Benz Smart same with Pistenbully to Kässbohrer
anyway I think this can go like this
while at it same story with this , i realised later this IMCDB listings
http://imcdb.org/vehicle_281994.html
I am not sure about "PB" in model name, on official site they aren't listed that way but on vehicle cabin themselves are clearly written "PB 300, PB 400 etc"