Hi Amos
I've read about this problem before, perhaps on the US site so a search may reveal the solution. It's a common problem I believe with after market exhaust systems (assuming you can still fit the centre stand) as the rubber stop on the standard exhaust is obviously no longer there. I bought a rolling chassis from DK a few years back and that had a small bracket attached to the frame where the clamping bolts for the centre stand go thus preventing the stand from going up too far. I think it was fitted on the right hand side. I'm sure I've still got it somewhere, but a quick look in the garage revealed nothing. It' too cold in there for any extensive searches. It was made from a piece of flat stainless approx an inch wide, 2 inches long and about 1/8 of an inch thick with a hole at one end for the clamp bolt to pass through.
Hope this helps
Cheers
Eric