denis
(O) toyota nut (O)
you could bend the corners by cutting a number of triangular indents into the horizontal part of the gutter, then you bend it matching the corner, then you weld it all back together... if you're familiar with your cutting/welding tools, it should be a piece of cake... if you can't figure out the width of the indents you have to cut, just make one side of the cuts, bend (with each "leg overlaping the ones next door), then mark up the exact lines, then cut...