SPC adjustable upper control arms

These look really nice and the price is great so I would consider getting them instead.
My only question is should the piece that holds the ball joint not be at an angle? It is at an angle on the original arms as well as Hotchkis and a few others to compensate for the overall arm being slanted backward in the car. Then there are other aftermarket arms that are just like these HDK ones as well.

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I have not seen an A-body UCA yet that was totally flat like that at the ball joint. Not sure how that would work out with your caster settings at all.

The other thing about those UCA's is their wide " U " shape. If you intend to run a wide front wheel, like 8" or more, they won't work. I had a set of UCA's similar to those and with an 18x9" and 6" of backspace the rims hit the UCA's at full steering lock, the "U" shape makes them wider than the original arms near the ball joint. So if you're planning a "pro-touring" style car with wide front tires they're not a good choice, you'd want a UCA with a tighter " V " shape.