There are many kinds of windshield blades. First, you need to measure the length of the blades. We don't know what RV you have so anything will be a guess at this point. Also, there are many different types of mounting.
Our Windsor has 32" blades. Those suckers are VERY expensive! I had O'Reilly's Auto Parts order them for me. When I have to replace them again I will be changing to 28" blades, which are common and a LOT less expensive! I don't think I will miss the 2" on each end.
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD