1988 toyota corolla GTS EGR Valve

Hi. I recently bought a 1988 toyota corolla GTS (coupe style) and when I went to get it smog tested for the registration it failed the test. One of the problems is the previous owner used a EGR valve that doesn't meet certain requirements and it needs to be replaced. I am having some difficulty locating it and a diagram of where it is and what it looks like would be great!

Thank you for the help!