Doesn't fit as well, but I'm pretty sure my core support is far from where it's supposed to be. Everything on the bottom of this car is smashed to hell.
Looks exactly like mine did. If you shift the whole stiffener a bit less than a 1/4" to the driver's side the stiffener will line up with the edge of the support and the bolt holes for the center brace will line up. All you need to do is loosen a few of those clamps, tap the passenger side of the stiffener with a dead blow until it seats against that corner lip on the core support and you'll be home free.
***Edit***
This is what I'm talking about. Just tap the stiffener over until it seats against that lip. The other side will slide in and do the same, and the center brace holes will be centered.