Original tailgate hinges. They appear to be slightly different than the hinges for an F1. The mounting holes appear to be set wider apart than on an F1. I tried fitting these hinges to a 48-50 F1 bed, because I need some hinges for the the F1 tailgate, and the holes didn't line up. You likely purchased a set for the F1.
Is this the e-brake cable bracket that you need? This one mounts to a frame crossmember below the bed towards the rear axle.
Or, did you have a transmission mounted e-brake? If so, then you'd have handles like the two on the left in the below picture.
I have other F2-F3 specific parts in case you need something else.
You can PM or email through FTE, or directly at modelking2000 at hotmail dot com.
I should still have a broken exhaust manifold from a 1952 OHV inline 6 engine that still has the heat riser and the counter weight on the end. However, I'm not sure if the weights are the same as on the earlier models and I'm not at home to check the parts manual.