Since it's a kerosene-fueled rocket motor (RP-1), there's only one kind of cryogenic tank per stage, and that's the LO2 tanks. So you're correct, that's the onl

Since it's a kerosene-fueled rocket motor (RP-1), there's only one kind of cryogenic tank per stage, and that's the LO2 tanks. So you're correct, that's the only possibility.