Alternator Pulley. We are an authorised distributor for Stallex parts. Equivalent to Part Numbers: OE: 391008;, 25139, 99660315250;, 99760315400 A�If you order before 12PM we'll dispatch same day from our UK warehouse. For guaranteed next day delivery please select this option at checkout. This product comes with free 365-day no quibble returns (UK only).