Anything 2009-onwards would be a 2nd generation Convertible like yours - the 1st generation Convertible remained in production well after the 2nd generation hatch was introduced. Changeover was mid 2008, I believe.
I've read that the wind deflectors of either generation fit the other, but I've not confirmed that in person. Certainly any 2009-on deflector will fit.
They do come up for sale on their own occasionally but my dealer was pretty insistent that if the deflector was part of the original car's order, I had to include it when trading in.
I think you may have to stump up the £180 to buy a new one from a dealer. You should get at least £20 off that if you ask.