Mounting on bedrail

Hey guys bought some cup holders on Amazon and im having a hard time finding t slot nuts to mount on the inside. The screw size is 8/32 i can drill it to 3/8s but was looking for recommendations for anything else. i tried a washer and nut combo didn't work. thanks in advance.

 

http://www.4xinnovations.com/05--17...dra-Bed-Rail-Accessory-Hardware-Kit_p_21.html

 

Carriage bolts work pretty well too.

 

What are you using to connect to the rail though

 

I slide the top of the bolt into the rail and then a washer and wingnut to tighten it down but you could use a regular nut as well. I'll see if I can find a picture of how I mounted my boards.

 

that nut wouldn't work but i could cut that bolt off what size is that bolt?

 

Sorry, don't remember off the top of my head. I know I measured the space in the rail and picked out the bolt with a similar head size when I bought those.

 

Got mine here, seller also has D-Rings and hand star screws.

https://www.ebay.com/itm/Toyota-Tac...ash=item2f104429d6:g:334AAOSwttVaJhht&vxp=mtr