Below are our main fitment groups. These are split into 4 main groups, wedge, festoon, bayonet and plug. Wedge bulbs have a plastic or glass base and are fitted by simply pushing them into the bulb holder. Festoon bulbs also sometimes referred to as torpedo bulbs have their connections on either side of the bulb, these come in 4 sizes. Bayonet bulbs have a metal base and are fitted by pushing and twisting them into the bulb holder. Plug bulbs or headlights bulbs are used for main vehicle lights, such as dipped beam, high beam or fog lights.