I've got a new never used bolt in steering box brace kit from ORD for 67-72 4x4 chevys. Its been moved around the garage for the last couple years so has a little surface rust but comes with everything including all the bolts. $100 plus shipping
www.offroaddesign.com
Bolt In Steering Box Brace for '67-72 GM 4WD Trucks
The straight axle GM trucks are notorious for frame cracks in the steering box mounting area. This kit is designed to prevent that problem by eliminating the frame flex caused by increased steering loads like lifts, big tires and off-road use. See Fitment Notes Below