i found these insluators by the Union Pacific, Illinois Midland daimond, there were some crossarms with CD 162's and 154's, they were all clear. The guy in the Ridgly Tower said they took the old poles down when they had there last ice storm, he told me to take as many as i wanted, so i did! one insulator i couldn't get off the crossarm, so i took the whole crossarm. These may be common, but i found them with my Dad so they mean a lot to me.