I spoke with the Jeffco EMA director on Friday... the 1953 Thunderbolt 1000 on Birmingham City Hall is being replaced in a few weeks. If I had to guess it will be replaced with a 2001-130. The Thunderbeam behind the Hoover Rec Center has also been replaced with a 2001-130. Pictures of both replaced sirens have been posted here before, but I could not find them.