D1 & D2 are the same bulbs, base looks different and the connector is different, comes without connector, call or email if you need a connector installed. Can not be used in free standing HID lights, but work great in place of HID systems in the front grill as a replacement for D1 and D2 HID bulbs. 2 bulbs in a kit.
SP11 Bulbs, Replaces the SP11 Halogen bulbs and base used on some CaseIH and Gleaner combines. Also used on some Cat models. 2 bulbs in a kit. New model summer 2019 - 6600 raw lumen, new better base.