These were recently removed from my Prinsu roof rack on a 5th gen. They're the 47" version that fits the Prinsu racks for the 4th and 5th gen 4Runners, as well as 2nd and 3rd gen Tacomas, RAV4, Chevy, GX470 and GX460.
Useful for mounting MaxTrax traction boards and all sorts of other things for off-roading and overloading. More info here:
Load Panel - Double - Prinsu Roof Racks
These are $280 new. Asking $100. Local pickup is fine, or I'll ship for the actual shipping cost, which should be around $20–30 depending on location. PM me for a quote to your address.