Hello webby73,
The part number is 12204-70020, you will probably need the rubber grommet too - part number: 90480-18001. The only place where I could find these in Bulgaria was at Toyota.
Did you checked if your valve is operating properly, when you take it off, blow air through it- if it flows from the one side, and completely stops from the other, you don't have to change it yet.
Greetings
Vesko