This rectifier (voltage regulator) is 4 a pin female configuration with an inline capacitor and is most commonly used for (but not limited to) 50cc to 250cc Dirt Bikes. Most popularly used for BAJA Dirt Runner 150 Baja DR150 dirt bike. Total case dimensions are 7.1cm x 5.9cm x 2.3cm. The total wire length is 19cm and the plug dimension is 1.7cm x 1.4cm. Baja DR150 dirt bike part number/model number is 30-150.