I'd buy the knuckle as a kit with the nylon cup and new boot, replace the lot.
You have to wonder what made that ball pin break- maybe the ball has worn thru the nylon cup and into the arm...
I'd check the other 3 corners while you are at it, these knuckle joint kits are cheap.
Then, It might ride level again.
I've only ever seen two break , both clubby fronts , I've been wondering if they had a quality problem at some stage for a brief run or there was something different in the top arm that was changed again .
