http://www.malkoffdevices.com/drop-in-mod/dropin-for-maglite-streamlight/d-cell-to-fit-mag-lite/2d-cell-drop-in-to-fit-mag-lite
 
http://www.malkoffdevices.com/drop-in-mod/dropin-for-maglite-streamlight/d-cell-to-fit-mag-lite/standard-reflector-to-fit-a-maglite-flashlight