wiper arm trim piece

Hi,
2001 Aurora
My wiper arms are fastened to the studs on the wiper linkage with nuts. The nuts are visible on my car. I think there should be trim caps, about the diameter of a quarter ($0.25), that would cover the nuts.

Would someone with a 2nd generation car please check if there are caps on your wiper arms?

Bonus question - do you know the part number? If you can pop one off and look inside for a part number I could use it to order from lambertbuick.com or some other online seller.

Thanks