Short wide staples for air stapler?

can anyone tell me what brand/size staple and gun i would use to shoot short, wide staples (something like 1/2" long and 1" wide). I need these to shoot on the backside of a square picture frame type thing, if you will, made of 1x3' or 4's. For clarity, the corners are cut at 45's, need a staple that will connect the corner. I would rather use staples than a finish nailer or screws. Thanks in advance.