I just bought a bunch of suspension pieces to redo my front end on account of trashed bushings. I’m looking at replacing both my lower and upper control arms. I stuck with moog products because I’ve heard of their high quality. I even opted to get a performance + upper because of the ability to change the upper ball joint. However, I bought these through advance auto parts and on their site they never had pairs (ie. having a left and right pair, they were only selling the left or the right side.) I made the assumption that two left sides would fit fine. However after getting my parts today I noticed that the ball joints are not perfectly centered on the upper control arm. I was just curious if I’m gonna have to look for fitting issues with my new install that I plan on doing this weekend.

 

Every place else lists a left and a right for uppers and lowers, I don't think they are interchangeable. Coil spring and torsion bar types are also not interchangeable

 

They are NOT interchangeable, there is a right and a left. I opted for genuine Motorcraft upper control arms when i serviced my front end, you can often find them at dealers at cost +10%.