Lexus uses a two step system in their paint, which is normal these days. You will need a base coat 4T2 and it will paint dull or flat. This will be followed by a clear like 2K clear. This is the only way the paint will look correct.
You can find this from many sellers online by searching Lexus spray paint 4T2. Parts houses like Autozone can order paints also.
If you want to Airbrush the paint you can order the correct colors and clear from source like Scalefinishes.com and others.