Yes they are no longer available . It was a part that Dometic supplied for the RM122 refer , it was the upper vent grill . Casita also used it on the front of the 13' & 16' with
air conditioning .
I replaced mine because it looked a bit shabby and had one of the vertical ribs cracked at the bottom .
It can be repaired by TIG welding and powder coating to be good as new . OR by adding a thin strip of aluminum and rivieting to the inside .
Here' a picture of it . The crack is at the bottom of the left vertical rib .
PM me if you want it .