National RV used Hehr windows in my 99 Dolphin. National did use another manufacturer in later years don't remember the name. That window manufacturer in no longer in business. You can check if Hehr has a emergency exit window that will fit your openings. Give Pelland Enterprises a called to see if they can help you. They are a Hehr distributor. I have two emergency exit windows one in bedroom and the other in the main slide. Both are sliding windows but when the emergency exit is unlatched it swings out because it is hinged at the top.
RV Parts and Motorhome Parts Online Outlet - RV Windows
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129