First 3 photos are for a good used OEM LR splash guard, from a 2013 Xterra and should fit 2005 to 2015 year models, part number 78811-9CA0A, Nissan says 2012 to 2015. Can't buy it by itself from Mr. Nissan as it's a discontinued part, only a pair for $62.
Second set of 3 photos are for new never installed rear mud flaps for a 2000 to 2004 Xterra, part number 999J2-KL002, no longer available from Nissan, $20 each or $30 for both.
If the ad is up, it's available, so inquiries asking "if available" and or without a phone number will be ignored. I don't text, and have limited time for emails so they won't get answered without a contact number. So, a phone call is best for a prompt and accurate response. John at 53ZERO-477-71FIVE8