Never seen this style of body on a 350 before. I included a screenshot in case the ad gets removed or updated.
https://www.autotrader.com/cars-for-sale/vehicledetails.xhtml?listingId=566912917
Amazon has a 25% off coupon currently for the Sliplo splitter protector. I'm not sure how long it will last.
https://www.amazon.com/gp/product/B086KZGZBD/