Need a part number for the driver's power window switch as..

Hi all --

I've recently had the "up" portion of the driver's power window switch
stop working on my '99 Grand Prix. It'll roll down just fine, and the
other three windows work fine, but when trying to roll the driver's
side window up, the switch simply does nothing. I've pulled the power
switch assembly out of the car and have talked to a few autoparts
stores on the phone, but they need a part number to let me know if they
have a replacement available. I've looked online, but I've yet to be
able to find one.

To clarify, this is the electronic assembly with the four window
switches and the "Lock out" button.

Anyone able to help, or at least point me in the right direction?

Thanks in advance --

-- Chris