Use a drill with a drill bit to make necessary holes for screws to sit and fasten the bracket. Use a drill bit slightly larger than shaft of screws, but smaller than the head of the screws.

I used a 3/32 drill bit.

Install new fastener screws to the bracket.

My build required 12 #6x1/2inch Philips screws. I used three screws on each end of the brackets and six screws on each end of the bracket.

The more screws used, the stronger the bracket is secured. (Two on the bottom of the bracket, and one on the inside of the track.)

If possible, use preexisting holes, and screws.

Sometimes screws protrude too far, you may have to grind the head of the screw slightly so it protrudes less.