The seller was helpful and exceeded my expectations. I usually only buy online from Amazon.com, but Google's Trusted Stores feature was just as good.
Louver assy all 4800 aerocool
Td/th 4800, pd/ph 4800/01, td/th 4812 o/s z4c02b
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.