FWIW, my tubular uppers from Reilly Motorsports are a little squeaky. I have verified it with my front suspension currently partially disassembled. The bushings in the polished rod ends are poly (or awfully hard rubber). I'm going to take them off and lube 'em up with Energy Suspension grease. I believe it's the rotational friction between the bushings and the spacer washers causing the noise. (And there is a right and left arm but it would be pretty whacky if installed wrong).
If you disconnect either the upper or lower ball joint and move the arm up and down you'll be able to easily tell whether there is binding and where the squeak is coming from.
Still, if Mancini will take the CAP arms back, then by all means do it.
