4Runner cargo shelf small plug

This is for the retractable part of the small cargo shelf recess that goes into the sides of the rear cargo area. It has an 15mm diameter post, a 3 mm screw hole and fits a 3 mm nut into a recess. The post is sized to fit into a 1/2" sched 40 pvc pipe. See my https://www.thingiverse.com/thing:2720254
for the matching large cargo cover plug. Mirror to create an opposite side