This Alternator Diode, GP GUARANTEED PARTS D-1P, is a vintage part that is compatible with Standard Motor Products. It is designed to work as a diode for alternators and generator parts. This item is perfect for those looking to restore older vehicles or for those who prefer vintage parts. The manufacturer part number is D-1P. It is important to note that this item is sold as-is and does not come with any guarantees or warranties. Please ensure compatibility with your vehicle before purchasing. Thank you for considering this Alternator Diode from GP GUARANTEED PARTS.