I've seem two (2) replacement rails that were installed, and had documentation for being non-conductive (UL)
Both were at HOAs pools earlier this year. Ironically, they were both installed to existing cups that passed the pool bonding certification test about 2 weeks before they were installed. Expensive item? I heard $750+.
Retested after they were installed, and cups were approved as 'pass'. Guess they had $$$ to burn.