There`s only one lower arm I know of that actually has numerous advantages over the stock ones and that`s SPC`s. I know because I was heavily involved in designing them.
They have lower seats that will accept either conventional springs OR coil overs. They have adj. ride height with regular springs and shims to adjust coilover travel and installed height if you use those. Greasable delrin bushings std. Optional modern progressive rate jounce bumpers, one of the features that helps new cars drive like new cars. Many aftermarket arms have no bump stops or jounce bumpers at all or they`re simply decorative and non functional. You know the ones that are inches farther away from the frame than the tie rods are...
hey that sounds like speed tech arms