On a 1.8L Rock Auto has the VICTOR REINZ Part # G31654 listed under "Throttle Body Gasket" as "Throttle Body Gasket Valve to Throttle Body/EGR Adapter" and rotated 90 degrees, it sure looks like it matches the bottom contours of the STANDARD MOTOR PRODUCTS Part #AC205 IAC valve's second picture, a few lines above.
It'll set you back $1.13 plus shipping.