The archaeology.ie has this townland recorded as Mountrussell, like the label on the (lovely) old photos , not Knockeehavrohinta.

The position recorded on there places the tomb about 200m SW of the grid ref on TMA, which might place it in the huge clearing you can see to the west if you look at the inline map here and zoom in.

The old photies look wonderful! Definitely one to hunt out. I must see more of Limerick soon. I always feel so guilty when I look at how little I've visited in those parts. I feel a plan coming on :-)