Early A wiper assembly question

Take a look at Mcmaster.com
These are the hardware specialists in my business. Almost without exception, if it exists....they have it. It may not be the OEM part that we would all prefer, but any friend that calls you out on it....is no friend. Mcmaster DOES have wool-felt cushioning washers (wave washers too), Ive seen them.

Any luck with that 66 Barracuda radio? MIA perhaps?