Hi James. You don't actually need spare bulbs although you do need 2 breathelisers in your car. The best deflectors I have used are the silver ones(can't remember the name of them). They have circles with another bit attached, which you don't actually use. If your bmax has the projecter lights it is worth checking where they fit though cos trying to do it on a moving train can be a challenge. Don't forget you GB sticker aswell.