What is the name and part number for this item protecting the undercarriage of the car on the 2013 Honda Civic EX (9th generation). It mounts under the car, and the conceals the compartment with the oil filter.
That part is the "lower engine cover assembly":
Honda part number 74110-TR3-A20. The insert plates there are also available separately, the large part only seems to come as a full assembly: