In The Forgotten Stones of West Mendip, 3rd Stone Issue 25 Phil Quinn names the Rolstone stone as this one at ST39576188:
http://www.megalithic.co.uk/article.php?sid=60312
He also gives the following locations for lost stones in the area:
ST36246240
ST38706110
ST37806180 (The Ploughman & Two Horses)
ST36206160
I have added site pages for the following locations that he lists as having extant stones - Banwell Moor Stones Extant (see nearby sites list above)
ST39036113
ST40406086
ST38756120
Source: The Forgotten Stones of West Mendip, in 3rd Stone Issue 25 (Spring 1997) page 15, Phil Quinn - Download from here:
mega.nz/file/fFonFAgS#3q9VHhjbwjJYJKzgU-XTA3mVPkArQWQ_HDmFthS7oU8
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