Where to get PSPICE models of ceramic resonators?
The equivalent circuit of a ceramic resonator has the same form as quartz crystal resonator.  There is a capacitor representing the static capacitance of the device in parallel with a series RLC that represents the resonating characteristic of the device. In the Murata Ceramic Resonator Applications Manual, available at Murata.com, these circuits are described and values of the parameters are given for Murata resonators. You can easily input this circuit into LT Spice.