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You have to use both pieces, the floor panel is not heavy enough to provide the necessary strength. If you're going to cut corners don't even bother installing them. You have to create a rigid box to transfer the load from the subframe to the rocker.
Exactly. The photo I linked is from Glazier/Nolan, so we know they stock the 2-piece box.
This is the same car, later, with the 2-piece box installed.