The picture on your link shows BMW pegs.

This is where I got mine (shows and image of XTZ fitment)

http://www.motohaus.com/acatalog/Footrest_Kit.html

They mount in two positions standard and low, which involves fitted the peg in one of two positions (diamond shape holes) on the mounting adapter supplied with the kit. It's obvious when you've got the kit in your hands.

http://shop.sw-motech.com/cosmoshop/...5152-13067.jpg

To me -15mm doesn't sound like a lot, but hopefully they'll be bigger than the stock ones as well.

Anyway, I've ordered a set and am eagerly waiting to try them out!

They are way bigger than the stock pegs!