This is what we learned over weeks of work: Hehr Industries made the Rock windows that Escape Industries installed in their trailers at least through 2018 when we bought our Escape 19. Lippert Industries bought Hehr Industries and closed them. This forced Escape Industries to have to do a significant remodel of their design for the front window. Lippert Industries did not care and does not care what they did to many of us. We reached deep into the industry and have been told that there are no parts that will work from Hehr Industries (doors and windows). We managed to fix our arm that had snapped off by cutting it slightly shorter, drilling a new hole and fixing it back. This is scary for the future. The way I understand it, we would not be able to just purchase a new window if it needed replacement that would easily fit into the 2018 Escape 19 - though we were not trying to do that - just replace the arm. Escape Industries told us they do not think the new Rock Window that Lippert (etrailer.com) now provides will fit in where the old Hehr Industry window fit as they are a different depth.