51,
I don't know anybody that has used that yet. I see it turning up on Ebay and I wonder if it is like the new metal front fenders, "will be available soon"! The other versions that I have seen are the combination ones above, and also the single types, like I used. Even the kick panels have to be reshaped to work. One thing for sure, the more information that you have on the original, the better. That may mean keeping one side in place while you are doing the other side.
The seat riser area is different in the sub as you know. The pickup uses about a four inch riser that forms the lip of a tub. All the weightof the front seat is carried at four attachment points about two inches in from the rockers. Therefore the middle of the floor does not carry passenger load directly. However, the panel and sub are different than that.