to my understanding since the K7000 started out only as 19", when games started shifting to having 25" monitors, they used these initially. I don't know for absolute certain because I didn't know what the different monitor models were then, but I think around TMNT 1989 they may have used standard res K5500s.
the first 25" K7000s were modified P447s, there's people that continue to insist I don't know what I'm talking about on this issue. probably explains also why Zenith were making 25" chassis during that early 90s period. I wish I knew someone that chronicled that period lol