It should be 53 and is probably listed as 'bright yellow' or 'talbot yellow'
Also, I don't know the condition of your paint, but a lot of paint places have a machine that will mix the paint almost exactly to your current color. I just did this yesterday ($117 bucks for a quart! Paint is getting expensive)
'88 GT- 3800 Turbo firstname.lastname@example.org
[This message has been edited by AkursedX (edited 04-22-2010).]