Hey...I realize you posted this back in Jan '12, but if you're still looking to swap out the silver engine cowling for a black version, I might be interested in a trade.
I'm in the GTA as well.
Let me know
EDIT: wait...just realized the MY of your car. Guess it wouldn't fit my 2011. Oh well.
'11 Z4 sDrive 30i; Space Grey, Coral Red Kansas, 6MT; Fully optioned & '11 28i X3 Loaded; Loaded '14 x328i