How about, I'll just use the 200khz transducer in it, then I will build my own circuit that will drive the transducer and be readily available for arduino interfacing? Can you help me with that?
No, that would be a pretty advanced electronic project as the analog electronics needed to interface with a 'raw' ultrasonic transducer can be quite complex and would at a minimum require access to a detailed datasheet for the specific transducer. Typically driving a transducer (transmitting a pulse) is pretty simple assuming you know the transducer's maximum voltage, impedance, and frequency specifications, but receiving the return echoes usually requires a analog amplifier with AGC (automatic gain control) such that is amplifies the return signal(s) more as time passes as return signals get weaker and weaker the further away the detected object(s) are. This would not be an easy project unless one had good knowledge and experience with electronics in general and ultrasonic interfacing in particular.