You can just bond them in place mate or you can drill holes etc to fit it properly but bonding will be fine however you will need to modify the boot lid if you want your reverse lights to work however there not an MOT requirement beleive it or not.
Not the worst looking set of wheels and its local to you, you could ask some one to pick them up! 45 quid if you dont have to include postage!!! http://m.ebay.co.uk/itm/121549943833?nav=SEARCH