This voltage regulator is designed for use with 1972-1975 Ford Mercedes BMW GRE-521 D5RY-10316-B alternators. It is a high-quality replacement part that ensures your vehicle's electrical system operates at its best. The regulator is specifically made for voltage regulators and is compatible with a variety of manufacturers, including Ford. This item is perfect for those looking to replace a faulty or worn-out voltage regulator in their car or truck. It is easy to install and is a reliable choice for ensuring your vehicle's electrical system functions properly. Purchase this voltage regulator today to keep your car or truck running smoothly.