The answer I got from Vern is this
The panniers cost £600UK and that is every fitting you need to ride away with. The only modification you need to do to your bike, is fit the small touratech indicators to the back www.touratech.de .

Alpos alloy boxes - at a quarter of the price.
You're not going to pay £600 are you?

I agree with Denis, as the owner of Alpos boxes and would suggest they are just as good as Touratechs. They are on a Touratech frame though. Oh, just as a wee note, the indicators Touratech supply with their racks are the crappiest things on the planet. Both of mine have split at the neck and are currently held in place by sparkies tape! (They've done about 5000 miles)
Matt