I was crawling under my Challenger convertible recently to see how something was routed for reference for my other Challenger I'm restoring, and noticed on one caliper, the previous owner used the rubber grommets that come with the caliper kits as positioners when he restored the car! The other side had the correct metal ones. I've had the car 19 years and had never noticed that before. At any rate, the brakes have always worked fine in that car, despite not having the correct metal positioners on the one caliper!