Greetings & Welcome!
A picture of the full sized window, and the dimensions in inches might help. Do they come with screens? (HUGE Plus)
They seem like an odd size to me, so I would guess that your main audience base would be people cutting new custom sized holes to mount them in. Things like cargo vans/trailers, box trucks, and maybe tiny houses.
Since they are short they could also be used as transom windows, or above/below bigger windows that don’t open.
Cheers!
"Be a trendsetter and support yourself !!!" ~ Camp4Ever