Porsche 924 Spark Plug Loom Inserts

This is a recreation of the Spark Plug Wire Loom that mounts to a metal bracket that screws onto one of the valve cover studs of my 1977 Porsche 924. In the PET the part number for the part is 052 905 471 B. From what I can tell the part is now unobtanium and the ones I have found on part cars are crumbling like mine was.