I know many of us have had the ball end ripped off the door strut by a sudden gust of wind. I looked at getting metal threaded ball end replacements but decided that I would rather have the ball end fail than destroy the door.
I got a dozen GSBŪ Nylon ball joint end fittings for Nitrogen gas support struts
at amazon for $11.29 with free shipping.
Fit like a charm, took 2 minutes to install, and I have 11 spares in my tool bag for the next time.
I noticed they were no longer available so sign up to be notified when they get more.