What loading capacitor do I use for my crystal?
The datasheet linked to is for the whole series from 3 - 100 MHz, so the load capacitance stated is the range of load capacitance over the series.  

For that particular frequency, the load capacitance is given on the product page (under technical specification - relevant part shown below):



As you can see the recommended value is 30pF for 7.3728 MHz.