Well Known and Active Website User
These are E9 30 so first and second ring. Not sure if I have an E9/1 oil ring to match. Might have something close, but they are not labeled so would have to measure them. Personally I would buy a set from Deves rather than use these. Not familiar with Thornton, but maybe easier if on your side of the pond, although it was a pleasure doing business with Deves.