So I was driving from Virginia to New Hampshire yesterday, and everything was great the whole trip, until I pulled into my driveway. Right when I was slowing down to turn in my driveway, the drivers side rear brake caliper died. Now I need a new one. I was quoted $450 from chrysler, and $250 from mercedes. I found a few decent looking used srt6 rear calipers for about $50 a side online.

What else would I need to make these work? I already am going to need one caliper and a new set of pads so should I just upgrade instaed? Or is it not even worth it and I should just replace the broken caliper?