Does part # 1451 come with a pair of shock mounts for one side, or both sides?

With 1 ea. 1451, you get 2 mounts, one for each side, uppers and lowers. We use these when replacing the stock mounts or adding an additional mount to the rear. If, you have no shock mounts in the rear or want to replace what you have, and want to run 4 shocks, get 2 sets, and they can be mounted in a V from the axle.