you shouldnt need to open up the clips at all. They are there to keep the pad resting against the bracket. The mach1 calipers will still have the pin that yall are talking about, i just installed some last weekend. If your calipers didnt come with the pin you need to find one, along with the washer and c-clip thing that holds it in place. The pin goes on the bottom of the caliper towards the rear of the car, its right by the silver metal clip in the pic. You can see the notch on the pad where the pin slides, it will be perfectly round where it meets the pin. You need to have that pin in there or the brakes simply wont work right.