Here's a direct quote from the instructions...
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Install solid bushing kit into k-frame. Be sure the clevis - rod-end attaching bolt is tightened prior to installation. Leave bushing nut loose enough that the assembly can be rotated slightly in the K-frame for alignment afterward.
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I don't see anything mentioning poly on his site in the sales section. Maybe you are assuming the bushings on the strut rods in the picture are poly?