I've been told that these seats came from coach 'G' in 9-car Pendos when that coach was reseated to standard. I'm not sure, and there was no response when I raised it on another thread.
From what I recall, they are 2+2 standard class seats, just with extra spacing and proper tables on the airline ones rather than fold down-tables, aren't they? Coach G in a Pendolio would have been the 2+1 reclining first-class type (as I recall - it was years ago now!).