this is the usual orange flasher. not very upto date

changing this is very easy, this guide will also show you what you need to do to change the bulb in your side flasher should it fail.
first step, grab something thin and plastic like your Lexus Owners Club Card as used here, and slide it into the rubber seal as shown here.

Push until the end of the flasher pops out
then remove the flasher as shown here

the grey connector on the back twists until it unlocks from the flasher unit, a bulb can be replaced or a clear flasher unit replaced with an orange bulb.
fitting the flasher unit back onto the car is just a matter of checking everything fits together nice and tight and then pushing the unit into the hole and thats it
Job Done
Clear Flasher on my GS300 now looks like this.

A vast improvement I think and its a quick and low cost cosmetic mod.
Many thanks to Chris Shipley for supplying the parts.