There were some spares (whether "new" or pull-offs I don't know) sold in the US about the time the big shipment of L42s were imported into the US.
Can't remember now if it was Sarco or Numrich that had them advertised. Gone by the time I saw the advertisement and attempted to order a few! Pretty sure it was Numrich. Early '90s Shotgun News advert, IIRC. Still wonder who squirreled away those bits!