On the left is a CD 166 CALIFORNIA with extra large embossing, and on the right is a CD 164 embossed CALIFORNIA unlisted variant. The right insulator is in proportions to a CD 164.

The insulator on the right has been determined to be a short pour CD 166 and not a candidate for a new listing. Though it does have the same dimensions of a CD 164.

You can see this more clearly when the right insulator is [id=243623455; overlayed on the left one].