When I bought my Rockwood ROO, there was a very general RV manual that applied to many RVs including motorized units, then oddly enough, in the same envelop there was a slew of manuals for the microwave oven, the CD player, the AC unit, the inverter, the hot water tank, fridge, stove, toilet, heated mattresses, tent canvas, vinyl siding, roof material and axles. Each showed instructions and parts lists as well as warranty terms. Makes for interesting reading on rainy days at the campground ;-)
Best would to find out which company supplied the roof for that year model and brand, and go from there. It's probably the same supplier for many different models and brands.