Ok, they look like they have been in a shop window for some time so you need to activate the rubber with something, like a solvent, or just heat them up with a heat gun and get them soft again.
If there the one's that come on new car's they will be the soft compond so put the softer one's (a's) put on back, and harder (b's) put on front.
If there the one's that come on new car's they will be the soft compond so put the softer one's (a's) put on back, and harder (b's) put on front.