Prosolar channel nuts and bolts

What nuts and bolts do I need for the Prosolar channel nuts?

Hi,

We are changing out solar panels and need some replacement parts - 5/16" sliding inserts (channel nuts) which I can find online P-CN-200 but not the washers and bolts.  Can you direct me to where I can find these online to add to my order?  We are on grid so it is urgent.  Thank you!  Kat