Doing research into some front end suspension components, I found this odd mixture of the need to clarify the upper and lower identity of control arms, even in the absence of an upper control arm.
I gathered so much as upper and lower control arm pairs mainly apply to trucks and perhaps large vehicles that need that extra type of stability. Is that accurate? My vehicle only has one control arm, so the need to specify upper or lower seems odd.
For example if you see this part, it is qualified with lower: Volvo Control Arm Bushing Front Lower
Is there something else that designates whether a control arm is upper or lower, perhaps not so much a vertical stacking thing but maybe a part of the vehicle frame it is fastened to?