Dash AC outlets on 2000 Monaco, found a source

I called Monaco parts about replacing the dash AC vents on my Monaco motorhome. No help at all. My vents are rectangular about 2.5 X 5.75 in. with a screw hole on each side. Finally found a source, a aftermarket seller on line. Nostalgic AC Parts. I purchased three and installed them and they were exact fit. Decided to order one more so all four are the same. Cost $15.00 each plus very reasonable shipping by priority mail. I'm in California the seller is in Florida. Ordered on Wednesday, delivered on Saturday.