Mine are very similar to Brad's. They are 3/16" instead of 1/4" (lighter and still plenty strong) and extend from fender opening to fender opening (one piece). My Jeep's has rock rash already and I wasn't worried about messing up the fender lip. I did herculine the outside of the tub behind the angle iron for rust prevention though. My question is why the need for super strong fasteners? If you come down hard on a rock the bolt isn't taking the force from the blow. The bottom of the angle iron against the tub is. If something is pulling the angle iron sideways from the body, the sheet metal will tear and bend before even a grade 2 bolt will break. Seems like overkill to me, especially when a search for a certain kind of hardware is taken on. I used 5/16" x 1" black oxide button heads and don't know what grade they are.
'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274