In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

SX-Key IDE has a DEVICE screen that will reconfigure your program for you much  more easily that writing it yourself. You might try to learn that feature as it saves a lot of worry.

Yes the resonator has 3 pins and the middle one is ground.  I went to a local electronics store and bought what I thought were resonators, but were actually small bandpass notch filters.  

If you got that from Parallax, it is definitely a resonator. It won't hurt to try it.

I am not sure about the marking, but you can search the web for manufacturers that will explain what the code means. It certainly seems to be in the ball park.  

Try Google for '500Q 50Mhz resonator' and see what comes up.  No resistor is usually needed with the resonator.  Generally, a crystal is more likely to require the additonal resistor.

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