Need some help on this one. Is the insulator on the right a 287.1 with an extended skirt or an unlisted variant of a CD 287? It has all the characteristics of a 287.1 but with the extended skirt. Picked it up in an old collection I recently picked up. Have never seen this variation before. Thanks Got my answer! It's a CD 287 didn't look close enough in the guide. Dumb me.