I'm going on memory with this, During the late 70's to early 80's Marine F models had their outer wings replaced along with some other work for a service life extension program. The B model wings where replaced with E model wings that also had the points for external tanks along with pods.
In the 00's external tanks got slung on them before they went to the boneyard, They came from the factory with low level control valves wired up limiting the outboard tanks to 7 or 7.5k fuel.