300te rear wiper - washer

Hi everyone!

good day as I got my rear wiper motor working!

I am now searching for the washer that goes between the rear wiper arm and the rear wiper post grommet.

I was unable to find this at local hardware stores, seems to be a specialty washer.

does anyone have a link to where I can grab one or a part #?

photo example for reference.

thank you.