Bumper shock (EAU) bypass

I have a 1975 Valiant with the energy asorbing unit bumper. I want to pull bumpers in tighter to body to get rid of the plastic. Whats the trick to shorten the shock? Would it be better just to build new mounts? I don't have the bumper off yet as I'm soaking bolts with knockr loose. I am trying to get a plan for tomorrow. Thanks in advance Mike
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