I have two used LEM 4.1 parts kits and one new kit. I purchased them all from Flagman (always excellent customer service!) and they worked perfectly. Two were installed in my P30s, and the extra was never opened. There is light wear on the used ones, as expected, but perfectly functional.
Used kits (2): $25 each, shipped CONUS.
New kit (1): $50, shipped CONUS.
Used kits (2): $25 each, shipped CONUS.
New kit (1): $50, shipped CONUS.