SKO, dont limit yourself to a F1 or F100. I have a box off a F6 two ton truck on my T and am very happy with it. The pitman arm is longer though, but that ended up being a good thing as I had to heat it and bend it to clear the split bones. Also, the triangular mount was not clocked correctly to fit inside my frame, but after seeing that Tardel usually welds boxes together for Av8,s, I figured I'd reclock the tiangle on my box by cutting it and adding the cut-off pieces back to make a triangle again. It worked very good and I couldnt believe how good this metal welds with a wirefeed. I ground every thing to a point and tacked and slowly started running beads. The truck boxes are usually next to free and I've found lots of dead trucks but very few pickups...