Any luck putting a Gladiator tonneau on a 2nd Gen Tacoma?

I'm looking for a used tonneau cover for my new-to-me 2013 Taco, Double cab, 5' bed. I've read the bed dimensions are very similar, but I seem to get the runaround when questioning manufacturers' about dimensions. I understand they want to make a fresh sale, but I'm in the market for something used, if I can get it. Any ideas?

The bed rail covers on my truck are pretty beat, so I probably need to replace those, along with the tailgate cover. It also has no tailgate lock, so I'd need to replace the tailgate handle (with camera) with a locking model. But I'm stuck on the tonneau. Prefer a hard top or roll-up for security reasons, rather than a soft top, but I'm open to suggestions, as winter is coming! TIA!