It's called 'bright yellow'. Paint code WA-8908. PPG code was 4089. Auto paint stores can mix it, but there would be a minimum quantity. I doubt if you will find it in the touch up pen rack.
Some people call it Talbot yellow, but I don't think GM ever listed it that way.http://www.paintscratch.com...rcoat-53-WA8908.html
[This message has been edited by Gall757 (edited 08-10-2017).]