Hi there
Well done on finding the cairns! I've never bothered, as omeone told me they were gone. They clearly aren't. I shall have to go back up there now, possibly tonight.
Where is this stone? Is it near to the cairns?
http://www.themodernantiquarian.com/post/46380
Also, the two stones you mention. Can you approximate a grid ref for them? If they're south of Piperstown they may be the Cunard stone pair that's also eluded me. I only learnt of this a few weeks ago and haven't made a massive effort to check it out, to be honest, but I'd love to know where it is.