2018 SB Toyota Tonneau Cover

Why isn't the 3rd Gen Toyota Tonneau Cover for a SB (5/Ft) offered on their accessory site. Can someone supply me with the Toyota Part # ???

 

I haven't dug too deep, but I need a trip folder too, and when searching for the OEM offering, I read somewhere it was only offered from the factory,,,,, not sure if that's true or not. I've had several Bakflips on my work trucks, and they've been awesome. I was only shopping OEM to see if it had other options, or what the cost was, even though if actually available for order, I doubt is less than aftermarket.

 

Wow i have one and this really made me think
This is all i could find. Have no clue why its offered in 3 parts unsure how it connects and i didn't see hardware listed cause there is a retainer bolt