I recently had to slam the brakes on my '87 300SDL to avoid an accident. My wheels locked up and as I was skidding to a stop, I heard a thud (the sound was very similar to the transmission shifting hard as a result of low vacuum). I made it home and realized that the ball joint broke off that connects my sway bar and upper control arm.

I read a post where someone else broke a piece off their rusted sway bar and mentioned it was a $1000 fix with an indy mechanic due to the nature of the repair. I could be wrong in my visual diagnosis, but it doesn't appear that the sway bar itself is broken. If possible, I'd really like to repair this on my own and save the money.

I see that there is a threaded connection. Does anyone know how I can fix this? I've attached a few photos for reference. Thank you for any suggestions or advice!