Finding the washer assemblies is gonna take you some time. They are rare, so expect to pay a pretty penny for it when it does eventually come up...and even then, you’ll have to be quick about it, since there are others who have been looking for a long time.

I would suggest modifying the car, in the meantime, and delete the washers, until you find one perhaps? You can buy the chrome parts that will extend through those washers, I think?

As for headlamps.... the only thing more rare than the washer assemblies are glass headlights for your car. Plastic? No problem. Glass? Good luck.

You may want to consider changing over to the 5.75” twin round headlight setup? They come in glass...