Will fit many 850 / 960 models.  Works fine and comes with a 30 day warranty.  You can still buy these new, but at a cost of nearly $450 they are rather unaffordable. A defective cruise control module is one of the primary causes of cruise control failure in these cars.  

 If your cruise does not work, It's a good idea to check for vacuum leaks and that the pedal switches are still working. if it still does not work, 9/10 times it's because this ECU has failed. Don't go around in your classic 850 with a non working cruise control system, there is a good chance this is an easy fix and you will have working cruise again! Thanks for looking and good luck!