Might be a little late but Atalanta Cutlery and International Military Antiques had some original '53 Enfield breech plugs and other parts. These might be for the 4th Pattern/Snider but it's worth a look. The ones I saw seemed to have good threads, just need clean up. AC wanted $23 for theirs. From what I'm seeing, these parts and guns were recovered from the Natal Arsenal that was found many years ago. British Brown Bess, (India Patterns & New Land) Enfield, (Mostly 4th Pattern) Brunswick, etc. Some were in Okay shape, others needed a LOT of clean up and some were the 3 R's (Rusted, Rotting Relics)