It is a straight swap for brake, tail and reversing lights. I will double check my Blinkers. I did not use any thing else with mine and everything worked perfectly and has for five years. HDC faults and going into limp mode over a light globe is a PITA. One of a few items I really do not like but it is easily avoidable with LED globes.
Rich is the Guru. 
My thread from 5 years ago which fixed multiple repeated faults in my Disco The faults then did not include gear box but give the wide variety of faults induced by a blown brake light globe or the switch I will replace mine again to see.
Going to Bright lights here this morning. I will post part numbers. Some of the links in the 5 year old thread show parts no longer available. The LED globes were the best change I made to mine bar none. Noted a tonne on ebay but as pointed out at the end of the old thread some types are not suitable.