Question about the Type VII A

[Krauter]

Whilst browsing the uboat.net site as well as reading the SH2 Manuel (it passes time nicely while on patrol.. the stories of Kapitsky and some technical info) I was reading on the VIIA (as it is currently my boat operating out of Kiel).

I noticed that it said that the VIIA did not have external saddle tanks, but the VIIB onwards did. Quickly checking the sides of my boat I noticed there were saddle tanks.. Is this wrong in-game? or was there saddle tanks for other things (fresh water, etc?)