Xenons4u is the UK's leading high quality and affordable car parts provider.Xenons4u takes pride to offer the best AL 1307329210 Volvo 31214563 Xenon Control Unit Ballast. If your main or high beam has malfunction and bulb is in working order, then you will need to replace headlamp control unit. Xenon module is factory fitted on Volvo V50 and S40 cars with Gas Discharge D1S 35W HID bulbs headlights. It fits only right side. For more details about compatibility list or book your order, visit our website.