Hi Unionguy,
I picked up my fridge vent at a Camping World Store. I see them in the catalog as well. The "Corner Edge" item? Is that for the side to front or side to back applications? If so the extrusions for my 1976 class c were out of production.
I picked up some 1X3 aluminum angle and formed it to the position with several relief cuts and then overlayed extruded flat molding that receives a vinyl screw cover. The angle was purchased at at a local metal supply and the other extrusion was purchases at a RV service/parts center. The extrusion was predrilled and easy to form over the angle aluminum. The two together look very similar to the original.
If the "Corner Edge" is the top/side extrusion that has a chanel for an awning, your rv parts/service store may have it in stock.
