The problem with poly strut bushings is they're too thick for the 67-72 strut rods, they will work with the 73 and up rods in stock form but not the older ones.
If you want to use the poly bushings with those rods you'll have to cut the thickness down on the inner bushings (slice them where they start to taper) and take the piece you cut off from the inner bushing and run it along with the outer bushing to maintain proper crush, so basically you'll have a half thickness bushing on the inner position and a full thickness plus a half thickness for the outer bushing.
If you try to put it together with a full thickness bushing on the inner position of the strut rod it will wind up pushing the lower control arm back when you tighten everything up and with a poly bushing in the LCA it will cause the arm to squirm its way off the bushing.
The other problem is the extra length of the sleeve causes the cotter pin hole to be covered, a nylon locking nut will be the easiest fix.
