groundpounder

I'm looking to upgrade the seat covers in my 06' reg cab but keep seeing different terms about the seats I don't know. My build sheet describes it as a 40/20/40 split bench. Here are my questions:

1. What is the difference between a 2 pc vs 3 pc console ? I don't have the floor console, just the little tilt out cup holders under the dash.
2. The middle seat has storage areas in the back and under the bottom seat. This appears to make a difference in the seat covers correct ?
3. I've seen the seat base described as "plastic" or "flap". My driver seat has the plastic base but the passenger has the flap. Are there multiple configurations ? The seat covers describe one or the other.
4. My driver seat has the manual lumbar and power controls but the passenger has neither. Are there multiple configurations of this ?