6.9 and 7.3 IDI lifters are one of the few parts that interchange with later engines. I know they fit the 7.3 Powerstroke and I believe they fit the 6.0 and 6.4 as well.
There have definitely been some ones to avoid. Motorcraft and International should be safe. I believe Mahle is ok but do your research don’t take my word. You have a larger audience to sample. Some folks on here that I would listen to would be Thewespaul (Classic Diesel Designs),Typ4, and icanfixall. Probably several I forgot to mention. Check your cam for pitted lobes. You are going to raise the load on the lifters don’t skimp. If you need a cam contact typ4.