I believe they would be considered stock parts since March of 2017. Late 2016 to early 2017 shock and rod ends were unavailable for a couple months while Arrma redesigned them. Many of us who purchased our Nero's or Big Rocks before Jan. 2017 will refer to the current shock or rod ends as v2 ends, but the part numbers are the same as the original parts. Because so many people had issue with the original parts Arrma stopped selling the v1 ends, redesigned them, and started selling the v2 ends using the same original part numbers.