I had a pile of those made to meet the WI specs for LE lighting as the factory domes on everybody's dash lights didn't meet the statutes and customers were bellyaching. I never heard of Federal offering those but anyone could have them made, I guess. I sent 100 of each red/blue halves to one of our local plastics companies and they fabbed those for us. It's possible those are starting to surface in the outside world. I sold PILES on FB3's over the years and eventually they were traded-in or taken out of service... I did the same to Dashlasers for the Code3 customers. Unless someone else had them fabbed.., but not likely. They would have originated around SE WI where we had them made. I still have a few in the warehouse that were never installed on beacons and some still on FB3's that were traded-in somewhere in the warehouse...