[GLH08]

the clip is on there to hold the caliper on while on the assembly line. That's all it's for. If you lose them it's no big deal and in some cases if you put aftermarket wheels on and feel a vibration afterwards take that retaining clip off and most times the vibration disappears. The stock wheels if you look on the back have an indentation that the clip fits into and most aftermarket wheels are just machined flat.