My good friend PJ has moved on and I've been asked to fill in until a suitable replacement can be found.
The 42" Sport had a couple of different models of the 42" deck. Looking at your model number and doing some checking you should have gotten kit #112609. Serial numbers are normally the trigger on what kit but I've been told the 929851 does not use the 111163. The 112609 comes with mulch blades.