i think the fronts are all about the same length. any longer and they would catch the wheel when turning
i put futv guards on mine and left the stock guard in place because they covered a small area that the futv guards didnt. being thin and mounted against the front of the arm, they can be positioned closer to the rim than an aftermarket guard. since aftermarket guards mount to the bottom of the a- arm using oem holes and the cross bars, you cant even position them farther outward
you could make some replacements like the oem pieces out of stiff plastic and replace the stock guards. use the stock guard as a starting template and make them longer on the wheel side.