Yeah, don't know how to describe them...um...like tiny skis with a tube in the middle...??
You push the tube bit up into the holes in the spoiler, with the long 'ski' bits facing lengthways down the car, so that they poke out from the bottom section of the spoiler, tape down these protruding bits with masking tape. Then eye up and just nip up the screws in the existing holes at either side of the bootlid, then making sure the skis are held down well with the tape, lift the spoiler back off again. The guides should stay taped down on the bootlid, if not, the pipe bits are slightly large and are staying in the spoiler holes, which means you'll have to sand them down a bit and try again. When it's worked and the guides are now taped to the bootlid, drill down through the pipe bit with a 3mm drill, then remove the guides and re-drill the holes with a 6mm. Then bolt down your spoiler!
**You WILL need 2 mates to help you line it all up and maybe hold down the guides when you lift the spoiler off, it's IMPOSSIBLE on your own!!
Mine turned out ok in the end, took about an hour.
Good luck!!!!