I could be wrong but I reckon that most of the mirrors out there that look identical are in fact all made in the same factory and then sold by various sellers on ebay with different mark ups. Up to you if you want to pay £15 but I'd wager you get the exact same mirrors as I got for £11. What's more, the £15 ones you linked to are located in the Netherlands whereas the £11 ones are in the UK which might mean faster delivery.