Type III HA Black Crenelated MDX Head .  The opening at the front of the head is 22.3mm.  It comes with an aluminum lamp retaining washer, head gasket and lens.  This will fit the MD2, MD3, And MD4 bodies.  All M series dropins will physically fit this head.  It is up to the end user to determine that the voltage is correct.  

MDX/MDM4 Tempered Glass Lens Kit (Ultra Clear): The tempered glass kit will be installed if purchased on this page. This is a 26.4 x 1.6 mm Tempered and AR Coated (UCL) Glass Lens for the MDX Head. Visible Light Transmissibility is 98%. This lens is chemically strengthened, aka chemically tempered, as opposed to heat tempered. High temperature resistance compared to standard acrylic lenses. It is more scratch resistant that float glass. Sold HERE.

Does Not Include M Series Lamp Assembly!