Pontiac Repair: Power window relay, gm dealer, door switch

Question
My power window stopped working on both sides.
I have changed out the drivers door switch for the power windows,passenger side works.
Still dont work.
I tested motors and they work.
Someone at the windshield place said my window relay must be bad. They went to the junk yard and found one but the numbers on it where off.
What is this part called exactly and would this be the only thing left that would keep the windows from working? I get power to the new drivers side dual power switch.And bought the switch from the gm dealer.

Answer
Hi Charles:

What model and year car is this? And let me sift though this both windows were in-op and you replacfed the left "master" switch now the right one works but the left is still in-op?  You bough some kind of a relay "used" and the #'s didn't match was that before or after the left side started to work?