Adjustable aluminum three rail bed extender, came out of a 2003 Dodge Ram, likely made by Amp Research, and should fit many full sized trucks like Ford, GMC, or Chevrolet. No brackets, but universal brackets are readily available for under $40.
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 with limited time emails won't be answered without a contact number. So, a phone call is best for a prompt and accurate response. John at 53ZERO-477-71FIVE8