First, you have to gently unlock the standing seams about 4' on each side of the hole. Only a little bit at a time or you will tear the metal. The transiton area of unlock should be about 12-18" from fully locked, to fully open.
A 2' section of the same roof material will work. Cut the panel in half above and below the hole. For the flatlock, make the cuts about 1" from the standing seams!
Seam the upper half 3/4" for a flat-lock joing, tucked under, of course. Seam the lower 1/2 3/4" over for a flatlock. Take your replacement piece, seam the bottom 3/4" edge down 90 degrees, Use the 'fold of the seam' to get lenght. add 1-7/8" and cut it off. Seam 3/5" over, slide it into place at the upper seam, and finish hemming the lower seam into a flat-lock. Use a sealant in the seams just before hooking them.