03 fuel tank options

[BWC]

I have a fuel cell right now in my truck and I'm looking to go back to a fuel tank. Truck is a crew cab short bed. Is there only one size I can get (~30gal) and can I use one from a 1500? Reason I ask about the 1500 is because they might have a smaller tank like 20-25 gal which would be ideal.

Thanks in advance