Aferim!
You can find NOS lint filters for that dryer. The next time I see one I'll post it for you. What changed most significantly wasn't the plastic frame for the lint filters, but the fine mesh was replaced by window screen crap. Not a big deal given that most of the lint gets blown out the back anyway.
That's not a 1977 washer; it's from the late Eighties and probably one of the last model years that offered Suds Return. Enjoy them in good health!