The toilet comes (or should have come) with the unifit adapter. The standard one is for a normal 12" offset. You can get the adapter for either a 10" or 14". Basically, this adapter seats to the normal flange with a wax ring and bolts, plus has 4 additional screws at the rear that need to be installed holding the back of the adapter to the floor. The back of the adapter also has slots for another set of flange bolts. Then, the toilet sits down on top of the adapter, and the toilet bolts to the adapter's bolts, not the normal flange bolts. Since the toilet normally comes with the 12" adapter, and they charge extra for eitherthe 10" or 14", if anyone needed a 10" or 14", the store probably has some 12" ones lying around.