Hello from Herts!
Got an IS200 Sport from 2004 3 weeks ago and liked everything about it except the missing armrest. When I checked the prices of the original armrests, I could not believe how expensive even the used ones are, so after a quick research I bought a Stilo armrest from early 2000s. Fitted it as a weekend project and covered it with a piece of black matching leather. I am really happy with how it feels and looks. I forgot to take pictures along the way but it is not very difficult to fit and a highly recommended alternative to the original if you have a few basic tools. I also fitted a Bluetooth adapter to the original stereo which only took less than half an hour. Next weekend project is installing a rear camera :)