1. D2/D4, double pin More Stable<br /> <br />2. 100% easy plug and paly, no modification is needed.<br /> <br />3. Simply remove and disconnect your original bulb holders and fit your HID bulbs with these one.<br /><img src="http://img6.eachbuyer.com/x9/p100/eb6437_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_6.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_7.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb6437_8.jpg" />