There are two types of centre stand - one for the bikes before 2007(?) and one for those afterwards. The later bikes have a different shaped set of downpipes and catalyst. It is the latter that sticks in a bit and will hit a protrusion on the older centre stand.
How do I know? I'm sure you can guess. The solution is to cut off the extra bits from the centre stand and then it works a treat. If you look at the image here http://www.davidsilverspares.co.uk/grap ... _large.jpg you can just see the bit to cut off at the back. It only holds the rubber bung and has no load bearing influence.
Once you have fitted it, the bike is so well balanced, it just rocks onto the stand - lovely.
Fitting is easy as long as you remove the silencer, loosen the headers and drop the centre bit of the pipes down a bit. The hardest part is pulling the springs onto the pegs.
Alan

