They add up to almost 900 MB, which is less than some Skyrim mods but definitely on the chonky side for Oblivion. You'll need to own the Shivering Isles expansion as well, but you probably already ...

“Oblivion” was launched in 2006 as the fourth ... including the highly acclaimed “The Shivering Isles,” which offered players a completely new game world. Bethesda has not yet commented ...