Which gas tank?

I got under my car today.
1971 Valiant Slant/6 Auto
I thought my sender was leaking. But no, my gas tank is leaking at the seam.
I was looking at the website below and got confused. It lists two different tanks. Both 16 gallon.
But it says something about early or late 71.
It says either 4 side vents with EEC,........... or a Front vent pipe?
I don't know which one i have?
Here's the two tanks.

http://www.autopartswarehouse.com/d...acementQQFuel_TankQQ19701971QQREPD670107.html

http://www.autopartswarehouse.com/d...QQSpectraQQFuel_TankQQ19711976QQSPICR11E.html