This video shows how to install clear side marker lights also known as repeater lights on a LR3, this procedure and the light is the same for the Range Rover Sport. The LR3 is also the Discovery 3 in Europe and the UK.
Sometimes when you buy the clear LR3 side marker lights they will come with the 194 Natural Amber bulbs.
THE BULBS USED IN THE LR3 AND RANGE ROVER SPORT SIDE MARKERS LIGHTS ARE 194 BLUBS.
If you have clear side markers, then you will need a 194NA (Natural Amber) like this: http://amzn.to/2b7wMg3
If you have the orange side marker lights, you will need a normal 194 bulb like this: http://amzn.to/2aVnOyv