You should be able to just cut out the holes and fit the foglamps. They are mounted on the bumper framework. The mounting holes should already exist, (I can't see them being any different from other bumpers.) You will need the foglamps and the mounting brackets complete. Best to shop around the scrapyards. I have a couple in my garage as I have just switched to crystals, (see my project section) but I do not live in the UK or you would be welcome to them.
You will also need the wiring for them and know how to switch them via a relay.