1992 ford crown victoria

New after-market pads did not have the small stainless steel clips to place on the ends of the pads. These clips ride on the disc brake caliper bracket. I have 4 clips from my replaced pads but need 8 clips [2 clips per brake pad]. I have not found a supplier [including ford] that will sell the clips. However ford supplies the clips with new brake pads.
1. Are these clips important?
2. Do you have a suggested supplier?
3. Should the old clips be used on new pads?