It is the menu_1024_768.ini file. There are already several mods with those changes, but I couldn't find any separate ones this morning when searching. You could take the "399_Same-Sized_HUD_Dials" s7rikeback made FotRSU-compatible in the FotRSU mod's "Extras / AddInModPak" folder, and compare that to what you have now. There will be other differences in the file, so be careful with what you pull out of it.
