Well right off the bat I will tell you that smittybuilt is not the greatest choice. They are made in china, and have a pretty bad reputation with quality control. The only attractive thing about them is they are cheap...you get what you pay for.
You can do something like the MCE flat fenders which are super cheap, made of tough plastic resin type material, poison spyder's like mentioned above , also look into gen-right, and metalcloak.
You should also check into getting the right size bumpstops as well.