All dealer will have problems with hard to get parts. That wasn't the issue with the 2 I mentioned. KTM-parts.com doesn't charge me for shipping twice when a part is backordered for more than a few days. They'll ship out what comes in (usually a day or two) and then email me when the backordered part is available and ask if I still want it. They only charge what gets shipped and won't charge shipping again for the backordered part, just the part cost. This has happened with the other 2 dealers without even asking AND charge for shipping. I'm not sure what KTMWorld.com would do as I've only used them once recently and didn't have this issue.
'08 KTM 450 EXC-R
"I LOVE my bike!!!"