Plastic replacement end cap set. Fits AMI D E, amongst others in this era. I included this in other models as some people have used these to add color or animation to horizontal bulbs. You can either glue the animation sheet to the inside or outside of the plastic ring.  Reinforced tabs designed to spin on the bulb with the supplied adhesive felt installed on each tab.

These are designed to fit Newer T8 or LED bulbs that are becoming more popular to fir into these boxes.  Original bulbs were the wider T12 bulbs, we have those end caps as well.