1971 Duster Lower Radiator Support Measurements

Hold the top using a metal brace . Then spread the bottom with a porta-power and weld.

Do this with a straight K-member bolted in place so your only spreading from the K'member front. Be sure your rails are not being pulled together with a bent K-member. .

Important to check the width the K-member bolt holes rail to rail using the measurements on the sheet I posted. It should be
32 1/8 inches center to center