try this link for bumper brackets.......
http://www.gmcpauls.com/bumpers2.htm
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www.xframeimpala.com
68 4x4 short fleetside deluxe cab 327 air
56 big window short stepside 235 dual 1 brls
64ImpalaSS 327
70 C10 LWB fleetside custom/10 350/TH350