Product review (5 stars): Ice Maker fits Whirlpool side by side/install notes
This item is a generic exact copy of a Whirlpool product and fits my Whirlpool side by side that was manufactured in 2001; this is the model with the ice auger and clear vertical ice bucket in the door and has the optical circuit board trigger.  Install was easy in our model has a sliding sled assembly that holds this modular ice maker.  Suggestions to make life easier you will need a 1/4 ratchet socket wrench. This makes it unnecessary to remove a shelf.  I use a short straight blade screwdriver to gently separate the four conducter plug that connects the ice maker to the line in the freezer.  I turned the ice maker switch to off.

Some tricks to make install go a bit easier:
1. Our unit has one vertical locking screw underneath that holds a "sled" that locks the icemaker in the fridge. Once you have the old unit out and off the sled(if you one in your freezer unit) carefully remove the end cap that covers the timing mechanism. Looking where the connecting wire goes in there is a kind of hidden tab that locks connector to the ice maker. Pry DOWN on this tab and the wire will slid gently come out of the icemaker assembly.  I would recommend using the old wire harness.  Wire harnesses rarely fail. ALSO the fuse holder clip on the new unit was in the same spot as the old unit.  The new wire harness fuse assembly will require moving the chrome clip that holds the fuse to ice maker.  Hence use the old harness.  The wire harness was not made to exactly match the original in my unit and assumes the installer will move the clip. There are plenty of You Tube videos installing this type of modular ice maker.
2. Keep the old ice maker handy to compare.
3. My unit had a really flimsy flap door that is easy to break - this covers the front of the ice maker unit and does serve some purpose but mostly causes the ice cubes to "hang" or bouce back into the ice maker.  You may want to experiment with leaving the flap door off.
4. Test your optical trigger by holding the flap door of the receiver side of the trigger and seeing if the led light goes solid. If the light shines solid on, the unit is ok. The led normally blinks when the main freezer door is open.
5. Ice maker units of this type take a long time to start working up to 12 hours. Until the device reaches normal operating temperature, nothing happens.  While it is possible to use a short jump wire to trigger the machine into cycling I would just wait. If the unit fails to make ice and there was evident movement of icemaker(look at the tines of the ice maker tray or visually inspect the wheel inside end cap with teeth - you need a new solenoid switch for the water supply.
6. Why bother? Repairmen charge $100 to $200  for a relatively simple remove and replace of component repair.
7. Various parts suppliers will allow internal repair of a modular ice maker. The whole unit on Amazon was about $35 plus shipping. Unless you enjoy component testing and repair - buy the whole replacement unit.
8. The worst thing about repairing the icemaker is reading the 8 or 9 point printed Model number of the fridge.