Need help with a brake part number Options

[Bricy]

I was heading home this afternoon on the interstate when all of a sudden my front passenger side tire started squeeling really loud. I got off and babied her home and popped the wheel off to see what the problem is and found this.

It's kinda hard to see but one of the clips are gone. You can see it best on the second picture it's the lower right clip.
I did a brake change about 4 months ago and everything was fine and now for some reason this clip is missing. When I popped the caliper off the brake pad was just dangling there by the pad springs. The only thing holding it on is the springs and the caliper itself. So what I need to know is if I can just go up to the autoparts store and pick one up and slap it on or is this a specialty item that I need to order? Any help would be much appreciated.