So, these are Spohn Performance adjustable rear lower control arms for GM F-body cars—that's Camaro and Firebird, 1982 to 2002.
They're made in the USA.
Brand new.

They have spherical rod ends instead of rubber bushings, which means less flex and more precise handling.

They're adjustable, so you can fine-tune your rear suspension geometry.

They feature inboard offset mounting, which helps with clearance for things like exhaust or wheels.

The surface finish is powder coated, and you can choose between bright red or gloss black.
The manufacturer part number is 203-OS.

These are a performance/custom part, so they're an upgrade over the factory arms.

If you're building a pro-touring F-body, drag racing, or just want tighter handling, these are a solid choice.
They're direct replacement in terms of mounting points, but the rod ends and adjustability are the big upgrades.
Made by Spohn, who's known for good suspension parts.

Check your model year, and if it's an F-body 82-02, these should work.
Good stuff.