Alienware 18 Laptop screen back lid replacement

I bought an Alienware 18 with dual 780m's, 256 SSD + 750GB hard drive, and 4800MQ off of ebay and recieved it today but unfortunately it has a pretty noticeable scratch on the back lid. I know this is gonna drive me crazy and I was going to send it back for a refund but the seller says he will knock £150 off the price which sounds like a pretty good deal. Bring the price down to just £1850.

Ive tried to find a replacement lid online but all I can seem to find is replacements for the R2, none for the new 18.

Closest ive found is a replacement for the 17 on ebay, but no 18.

Anyone know where I can get one of these badboys?

Thanks