3 different tanks for Challengers
70 has no vents
71 has 4 vents on side
72-74 has 4 vents on back

Even though I have a 70, I wanted the 4 vent system to add the later model ECS system to vent tank to engine and not just to outside air like 70.
Get the cheaper tank and plug vents if you don't use them.

They all have the same pump.
Check pics on RockAuto and you'll see the differences.