No it won't, the fitment on the reverse is completely different to the Golf one shown like below (Golf left, Polo Right).
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Even more confusing there are two types of airbags for the MK6 GTI, one for MFSW and one standard. You need to get it right otherwise you may have a hard time depressing the horn function.
When buying the airbag make sure it comes with the harness wire, otherwise you need to purchase that on top too.