The finish that is compatible with the biscuit color is Sedona Beige.
Yes, the seat that is recommended can be located here. It is the SS114
CT model is just the bowl.
It still connects like normal to the underside fo the tank.
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