the AF Pullman looks like a 3161 and the Pullman observ a 3152. Not aware of any replacement roofs (rooves?) but complete donor cars aren't all that bad pricewise.
the Dorfan Observ. will be a lot tougher, you usually find them paired or trio-ed with a Seattle Pullman and/or a Boston Pullman (have seen Atlanta Pullmans in red as well) but your Observ. appears to have roofs held on with two finials. That makes them especially hard to come by.