RD-7800 is probably the latest and greatest that will work, if I remember right... I think they changed the cable pull when 11s came along? I know they changed it at 10s for MTB. But before that, you could mix and match as much as you like, except I think 7s and 8s Dura-Ace was different.
I'm only 50% on this though; my knowledge is rusty.
...Yeah, I think that's right:
https://www.sheldonbrown.com/speeds.html
https://www.sheldonbrown.com/dura-ace.html