Here is a link to the service manual for your workstation.
Scroll down to p.75 to see the pre-requisites and procedures necessary to 'remove' the fingerprint reader board. Reverse the procedure to install the board.
Here is the part number for the fingerprint reader board including adhesive tape and bracket in case you haven't got all the parts, 734286-001.
If you search online using just the part number, nothing else, (do not add HP or fingerprint reader to the search term - it will just skew the results), you will get suppliers of the part.
Here is a link to just one supplier. It is shown only to give you an idea of the cost.