Rear shocks / struts

You don’t want that junk on your shocks. Just remove and throw them in the trash, put the new shocks on.

Spring helpers are not recommended for worn out springs. You want new springs and bushings. Think of the metal fatigue after almost 60 years of supporting the weight of the car and lord only knows what else.

Are you planning on towing or putting 200 plus pounds of crap in the trunk?