OE Tonneau Cover P/N.

@Garrx7 have you tried ordering it online?

 

cemented, I think im ok now i order one on eBay im just hoping its the right part
"Genuine Cap Tonneau Cover H 64918-04010"
https://www.ebay.com/itm/152701459731 its the

small part for the left side

 

That should be the correct part. If you get the wrong side, you can unbolt the rubber trim with a torx bolt by peeling it back slightly.

 

That happened to me as well, the truck is under warranty and Toyota will replace the whole cover. its been 2 months and still waiting. I have truck until the part arrives.

 

Thank you for your post! I spent 3 days trying to find these part numbers and verify they were correct.

BTW... LH is driver side... The marine corps only taught us port and starboard.