Here's a starter. Swan gives the following list of standing stones (as a starter!) as "the principal examples existing in Inishowen:
1. nr Muff village
2. ditto (sculpturd stone at Ardmore) - (which I presume if the Ardmore CR)
3. Whitecastle
4. Along road two miles north of Movill
5. Shroove (cross incribed)
6. near Carndonagh Workhouse
7. Glentougher Road, 3 miles from Carndonagh
8. another near it
9. Magheranaul (Isle of Doagh)
10. Cloghorna (Ballyliffin)
11. Clonmany (nr Gaddyduff School)
12. Rooskey (nr Clonmany)
13, 14 & 15. Gransha (nr Buncrana)
16. Milltown, Buncrana
17. Desertegney (Old Rectory field)
18. ditto (Black's Farm, Muineagh)
19. ditto (M'Laughlin's Farm, Leophin)
20. Crislaghkeel )Upper Fahan)
21. Carnaghan (Inch)"

Imagine they're catalogued on TMA somewhere - I just couldn't find a few with the names he gave & it'd be good to have 'em at least listed for someone to add info about. There's quite a lot more, which I'll add later.