I approached Cefn Penagored ridge from Pennant cairn and walked along its western flank looking below me around me and everywhere, I could not see the circle of stones in cofleins pictures nor could I find the kerb cairn with central cist, but this little cairn (pictured) might just be one of the two satelite barrows next to that one.
Even when I came back the same way but favouring the lower slopes I still couldnt find it, but I did find the Penagored standing stone.
The Coflein description sounds interesting:
"Remains of a cairn defined by a circular ring or kerb of upright edge stones and a central burial cist lined by stone slabs. The cairn is accompanied by two simple round barrows, possibly satellite cairns, both 3m in diameter and 0.3m high."
Unfortunately I couldn't identify anything amidst the mass of stones that lie around!