The big metal brace that the centre exhaust hangers fasten to(looks kind of like a boomerang or stealth bomber shape).  Mine has rusted to hell and I need to replace it.  It bolts to the underside of the car around the centre section, front area and has two rubber moulds in it that the exhaust hangs on.

 

Cheers,

Sam

Which bit on here ?

 

No 13 (rear box) is 1j0253144j

No 12 (floor support) is 1j0802117b

No 9 are the actual exhaust hangers 1j0253144g

Ahh it's Part 12. 

Wow why is it so much for a new one.  £45 on ebay..

This one looks relatively unrusted? About half the price.