I'm not exactly sure how to do this. I'm more of a software guy than hardware...
Can you provide a link to the transistor and diode I would need? And also a schematic I can follow?
(edit: I suppose the schematic provided for the solenoid is what you're referring too? So would I just use the regulated 5V line off of the arduino (that is powering the ping) to also power the motor? And then use a data line to go to the transistor? If so what transistor and diode do I need?)
I am using the Arduino Pro Mini 5V.
So far the project has been a real success!
Thanks for all your help.
(edit2: Going from this site arduino | AK Eric the author claims that the motors only draw 20ma. My pins can provide 40ma each so I should be good. Also I just realized that only 6 of the 14 pins can be used for PWM and I got lucky and picked #3 for the motor 
Since the motor should be fine I don't need the transistor but should I use anything else?)