Unistrut channel nuts.
mid clamps
Solar Panel Mid Clamps 1.06" - Pack of 20 https://a.co/d/8BqNvhG
end clamps
Adjustable End Clamps -Planet 4 Solar (UISolar) Pack of 20 https://a.co/d/a5B5un2
of course size quantity and thread size as needed. I used 5/16 stainless hex bolts sourced from eBay. There are a lot of suppliers with varied pricing…do a little searching to get what you need at the best price.
Unistrut P1006 Series Spring Nut, Channel Nut with Spring
Unistrut Channel Nuts are designed to conform to the flanges on the inside of the channel.
unistrutstore.com
mid clamps
Solar Panel Mid Clamps 1.06" - Pack of 20 https://a.co/d/8BqNvhG
end clamps
Adjustable End Clamps -Planet 4 Solar (UISolar) Pack of 20 https://a.co/d/a5B5un2
of course size quantity and thread size as needed. I used 5/16 stainless hex bolts sourced from eBay. There are a lot of suppliers with varied pricing…do a little searching to get what you need at the best price.