I made some after breaking three of my originals. I used 3/8" plate, I think 1-1/4" wide (not positive). I made them 1/2" longer than stock, for a 1/4" lift. After cutting the four pieces of metal, I tack welded them together at the ends and drilled the holes through them. I then cut and ground them to shape, grinding off the welds last. I also went up one bolt size (I think they are 1/2" now). They've been on for a year or two and seem to work fine.
Pete
'83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
'97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd