All of the window operators are generic to the trailers. you need to check with someone like Vintage Trailer Supply for some of the older trailer parts. Over the years the manufactures have used a bunch of different designs. You may have to email a couple of photos to Vintage.
Oh and welcome to iRV2.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot