Which parking sensors did you replace? Or was it all 4 in the front that need to be upgraded? I'm doing this conversion now and it looks like PN 28438-4BA5C is the grill sensor that I'll be needing, not sure if I'll need the covers and the other 2 sensors (located under the headlight in the bumper) as well. Thank you for the write-up though!I recently got into a front end collision that is forcing me to pay out of pocket. Long story but I wanted to go ahead and post the parts list of what I am using to convert my car to a 2018 Q50S front end. For reference, I have a 17' Q50 Red Sport with sonar + parking sensors. This may vary depending on your specific model (sonar, parking sensors, etc).
I ordered through Discount Infinti. In summary, you will need the bumper, fog lamp bezels, lower/upper grille.
Bumper: 62022-6HJ1H $460
Fog Lamp Bezel: 62257-6HJ0A $80
Fog Lamp Bezel: 62256-6HJ0A $80
Lower Grille: 62254-6HJ1B $100
Grille (I chose Black Sport Grille with radiant emblem + sensor holes310-6HH0C $500