Inner rocker panel repair, Help

[kcfirstbuild]

So I'm making head way on my Cab repair. My body guy says i need more body panel parts. I loaded a page from LMC to help point out what im talking about. I purchased Part # 4 ( Cab floor Rear ) but i'm needing the piece in front of that. So, would I have to buy the Floor pan and cut out the piece i need. But, I also see that its only the front half.
I think I need to buy #7 but I already purchased the rear half of that. so, Im kind of shying away from that.