under carriage flap

I hadn't had the car 3 weeks and the other week I ran over part of a tire at highway speeds. Luckily the only damage was the front left tire undercarriage flap almost came off. I was able to reattach but I'm missing 2-3 nylon retainers. Similar to this.
https://www.amazon.com/dp/ (commissions earned)

Any idea where I can find a part number or proper size? Otherwise I'll wait until I take the CX-5 back to the dealer for the first service and firmware update and address this then.
 
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