As mentioned the eBay copies will have no rear covers, will let all sorts of sh*t in though them such as rain, muck, grit, salt etc which I'm not keen on. Genuine ones are around £80-£90 new for a full set (all 4 pieces). Not sure if VW still sell them but they should. They were standard on the very first UK spec'd GTI's.
I've got the original P/N's somewhere if you want?
Mine...