sorry have no pics of pistons but, the way to tell between a 4x4 piston and a 2wd piston is that the 2wd gudgen pin in central where as the 4x4 pin is off set (very slightly tho so look carefully) to combat piston slap/rock. Also the 2wd compression bowl is larger than the 4x4's altho thats a pretty useless thing to know if you only have one type of piston and no other to compare with