With a standard 12" rough, this toilet will have 3/4" of room behind it. It also allows for an adapter kit to be purchased for either a 10" or 14" rough in. To ensure that this toilet would work for you we would recommend purchasing the TSU01W.10R which you can find here.
It comes with a standard 12 inch roughin but nothing else. If you need a 10 or 14, it is ordered serperately.
The toilet comes standard with a chrome lever. You can purchase a brushed nickel one in addition. The model number is THU068#BN