If your talking about the (deleted) rear seat brace then +1 here. I'd like to lose the rear seat as well, and the Boss setup looks nice. I've been hoping it pops up for sale on FRPP, but I'm not holding my breath.
I haven't seen the Boss in person yet, once I can, I hope to snap some pics so I can see how the factory did it and fab a knock off, maybe have a mustang logo laser cut into some flat stock for a stiffener at the center of the "X".
I'm planning on aftermarket seats and a roll bar, so the rear seats will be useless anyway.
If that's not what you're talking about, then, umm.... never-mind.