Thanks for the info Greg.
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I ended up using a black shelf from Home Depot. The woodgrained shelf was abut 2 shades lighter in color.
Black actually looks very good compared to the original wood with a cheap vent cover. It blends well with the Fridge. I'll have a small gap on the bottom for air intake. I'll hold it with velcro to allow easy cleaning and service of the AC evaporator.
$5 and I don't have to cut it...it was a perfect fit.
Here is a pic.... not installed yet. You can see the stained/moldy panel from the AC leak on the floor.