I'm posting this for a friend. He had these cut out of spring steel using a EDM machine. Obviously they will need to be fitted. My friend a michanist couldn't find a replacement set for his Parker so he cut them out. He has fitted them to his VH 12ga and hasn't found a problem yet. He wants 25.00 a spring or 40 for a set. I don't know if this reasonable, i guess if you need a spring it is.