VXOC Astra-J/GTC

I have been trying to find out what horn my J has as it kind of stopped working properly recently, all I get from it is a faint meep.
I think it went due to water damage :(
I can't see through the grill or under the bonnet as to whether I have a single or dual tone horn.
Anyway I have been hunting high and low for info to help me choose the correct horn to fit and I keep seeing conflicting stories on which is correct.
My car is a 2010 60 plate 1.6 SRi.
Does anyone have any pointers as to which part I need? Just don't fancy having to remove the bumper to find out 

Thanks Craig

PM your reg and I'll look it up for you


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So you have a U07 Horn fanfare 400/500mhz which is 2 tone horn. new Part number 13409130

Thanks Rusty, really appreciate the help