There is a track that leads up to the stones marked on the map. Its tricky enough to spot, basically a cattle crush is at the entrance(heap of gates to the lay man). Follow the track up to the end of it, you should be able to see them between the end of the track and the Mahurslieve. When I first saw them I thought it was a cracked standing stone. However it is two stones about 0.5m high lying up against each other.