That's neat! When I put the new ones in - '06 or thereabouts, I didn't see any option of such a transducer. Admittedly, I didn't look at the air guide catalog - just looked at the optional transducers in the Garmin package and fairing blocks came with them. I replaced the oem wood one because it was starting to deteriorate anyway. But had I been aware of this transducer (if it was available then) I would have removed the old block and installed this 'ducer!