Hi Sachin, i have just done the led swap on my is200,
If you plan on changing the indicators you will need to swap the relay also as when you change to led the indicators flash twice as fast (like you have a bulb blown), reversing lights are a straight swap but if you swap the brake lights you will get the waring light on the dash saying you have a brake light bulb out, to stop this from happening you need to remove the left hand boot trim to get access to a multi plug that has 4 wires going into it and cut 2 of them to blank this warning.
I cant remember which 2 wires but i think i have a pic some where.
So if your still planning on doing this here the style of blubs i used after trying a few before hand.
I used this style for leds/smds for the reverse and stop/tail and front indicators.
This style for indicators (rear)
And this is the relay you'll need.
The side indicators have these in them.
When you order the bulbs you need white for the front indicators and amber for the rears, and white for stop/tail as they sit in a red lens anyway.
Hope this of some use to you.
Hope this it of some use to you.