Are there weights welded into the ends of the stock bars? If so you may have to drill/tap those to make the handguards go on easily. That's assuming you still have the stock bars (I forgot). :)
But it's a VERY good thing you got those hand guards. They'll save you a bunch of broken levers. If you have the room in your budget, I'd still consider ordering a spare clutch and brake lever and keep them around just in case. I did manage to snap a clutch lever on my KLX even with hand guards, but it was an unusual situation... still it can happen.