Hi, Rosemv.
The Pro9000 is compatible with the same print head as the Pro9000 Mark II, though the reverse is not necessarily true. If you are in the U.S. and need to purchase a replacement print head, the Canon U.S.A. Parts Ordering line is available Monday through Friday, 9 am to 7 pm Eastern Time at (1)866-481-2569.
The print head part number is QY6-0076-000.
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