I purchased a rear anti-sway bar from ADDCO.,
Solid not hollow, mine still looks new after 10 years.
Not sure if they still do, but they used to make them for auto manufacturers.
Their production facilities were accross the street from my shop , it was pretty cool knowing the workers . They had no problem with getting everyone whatever was desired.
I bought a bar for my old van , they did a one off then I had an issue , the owner showed up in his white tennis outfit ,driving a Delorean . He put a rag on the floor then crawled under , said he saw the problem. He returned in 10 minutes with some different brackets , fixed the issue .
Then accepted the cold beer offered to him.
We had our shops about a 1/2 mile down the dirt road that had puddles over 6” or more on a daily basis. It rains every afternoon here in south Florida in the summer.
This guy did not give a damn **** about that car, everyone in the neighborhood got a kick out of that muddy delorian, or however it’s spelled.