Bought the front moulded one on ebay not too cheap.
Seen the rear moulded ones on a van on the road and the wind had them completely folded back not great looking.
I have a set of genuine front ones taken from my X250. They are in good condition and cost about £65. Yours for £25 plus postage. They connect to the ridge under the doors and to the edge of the wheel arch.
They are same as these on ebay Item number: 230520237271