Neidner and/or Biesen trapdoor buttplates

Does anyone know if there is a manufacturer who still produces trapdoor buttplates similar to the long-discontinued Neidner and Biesen versions? I have looked high and low on the internet, and all I have been able to find is the buttplate offered by NECG, but it is not a trapdoor. I can't believe that nobody makes a steel trapdoor anymore. Thanks, bob r.