The insulator on the right is the one in question. My first question would be who made it? It has a point on both the front and rear skirt. And compared to the insulator on the left which is a CD 164 B, it is nearly 1/4" shorter in hieght. I don't see any insulator with any point discription listed under CD 164. When I first saw this insulator I thought it was a star without its five points. If anyone has any information to offer please email me. Thank you!