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On my bathroom scales looks like 12-13 kilos. I dont know how much the postage will be, but the parcelforce website will work out the charges if you put in your postcode, mine is RH10. then again it might be cheaper to use a courier?
I am not sure if it will fit, but I have compared it with my STi spare and it is 1 inch smaller on the inside rim. The STIi inside dia is 15" and the WRX is 14". You might want to measure your wheel area, but I dont tink its gonna work!