There is no such thing for a 2wd.
The front axle setup is different from the 4wd.
The front coil rests on the lower control arm not like on the 4x4 where it sits on the shock and therefore can be height adjusted with some aftermarket shocks.
On a 2wd changing the shocks will get you nowhere in regards of ride height.
If you plan on lifting/lowering a 2wd you have to deal with either installing different coils or a coil lift kit.
2wd setup:
(not a ram, but it should give you an idea of what I'm talking about.)