I have a pair of black Smittybilt step bars off my 1st gen ext. cab. the bracket for the front mount is still welded to my truck so unfortunately you'll have to locate that yourself, I wasn't at the liberty of a cutter to remove it. the rear bolts straight to frame through square hole below the split between cab and bed.
in second picture the left is front bracket mount, right is rear mount surface.
asking 50. local pickup (Bakersfield, CA) preferred but might ship