Not sure if your brackets are similar setup to mine...but with a 2"bracket you can decide where your bolt goes through the side of panel and adjust standoff height as required. Heres a pic of a similar setup to mine.
https://www.google.ca/search?biw=1366&bih=637&tbm=isch&sa=1&ei=SKMmWv_yHoKejwPgroSIDg&q=aluminum+l+brackets+for+solar+panels&oq=aluminum+l+brackets+for+solar+panels&gs_l=psy-ab.3...36060.38521.0.39198.17.17.0.0.0.0.126.1555.11j5.16.0....0...1c.1.64.psy-ab..1.1.105...0i30k1j0i24k1.0.WKdnh5AiBKM#imgrc=KaFUjEK_T0lx2M:
