Wiper arm insert replacement?

[ScottInHouston]

First time poster here. I just bought a mk3 from someone up in Wisconsin. I’m in Houston. I absolutely love the car and can’t wait to get through inspection/registration so I can enjoy it but have a small issue. On one of the windshield wiper arms the metal insert that slips over the post coming up from in front of the windscreen is broken. Is there a way to just get a replacement insert or is it possible to just get one wiper arm or do I need to order the full $500 assembly listed on the parts section of the ffr site? Wipers have to work to pass TX vehicle inspection. Otherwise I wouldn’t care in the slightest that the wipers on my roofless car don’t work. :-)
image.jpg
It’s the metal insert that fits in here that broke.

Any help greatly appreciated,

Scott