Tried to drop my 08 down to a 3.5" krator riser today and found that either the oem bar is slightly out of round or the riser has an oval center on both sides.  Havent measured either yet, just wondering if this is a common issue and how most people solve it.

Have the clamps got two screws each? I found that the 1" bars I bought were just slightly larger in diameter than the stock bars. I had to tighten the screws on each side a little at a time and make sure the slight gap stayed even. In the end I have a very slight gap on each side but they are secure and it looks fine. It might just be a case of different manufacturing tolerances.