New window and frame for a 1953 Spartanette

[Atx2001]

Hello riveters, I'm looking for advice on the situation I inherited when purchasing my 1953 Spartanette. The original front window and aluminum was removed and replaced with cheap tin (as seen below).

How do a find a replacement aluminum window about the same shape and size as the original (something like 22"x62")?

It doesn't have to be an exact match. I'm open to single fixed sash pane of glass in an aluminum frame (trailer won't be traveling).

Open to any and all ideas! I don't even know where to start asking around...

[rugjenkins]

Would it be a curved or straight window? I have a few windows from a 74 argosy. I have a large one from the front and back and a few smaller ones from the sides. Just like the ones on the argosy in the background [emoji16]