This thread is going to cause much confusion for future searchers.
-The 990 SMT has cast 17" rims from the factory.
-The 950/990 ADV, and 950 SE sprockets many have stated and listed Above WILL NOT WORK on the 17" rims.
-The 17" OEM rims have a different Sprocket setup as well as a different Brake Rotor setup.
-Custom Sprockets can be MADE for the 17" Marchesini Rims, but KTM does NOT offer them.