Can you only get this bolt from Toyota?

I got a set of trail edition boxes for my 2019, problem is that the bolt is too short with the D-ring on it. Checked multiple stores including NAPA and Autozone and there was no bolt even close to it. Is there somewhere that sells these bolts? I need a longer one so I can keep my D rings on

 

No. You can get them off a wrecked truck at a salvage yard.
Or take measurements and buy a shoulder bolt of the size you need....
But single "specialty" bolts are expensive in my experience.

 

If it'll work you could get a regular bolt thats however long you need and get a spacer to account for that shoulder. Not ideal but just a option.

 

Mcmaster Carr may have a shoulder bolt that would work.

https://www.mcmaster.com/products/shoulder-bolts/shoulder-screws~/