Cadillac Repair: DESCRIPTION, power steering pump, power steering pump pulley

Question
ON A 89 CADILLAC SEDAN DEVILLE,4.5 LITER, THERE IS A PULLEY SOME WHAT IN THE MIDDLE, IT'S NOT A POWER STEERING PUMP PULLEY OR WATER PUMP PULLEY. I NEED TO KNOW WHAT THE DESCRIPTION IS FOR THAT PART. FOR MORE INFO, IT SITS IN FRONT OF THE FRAME OR FIRE WALL. CAN YOU PLEASE HELP ME? THANK YOU SO MUCH FOR YOU TIME. ALSO, IF POSSIBLE, CAN YOU EMAIL ME A PICTURE OF WHAT YOU THINK I AM TALKING ABOUT? THANKS AGAIN

Answer
Hi Leonard, I'm not able to send pics but across the top of the engine left to right is the idler pulley, alternator, tensioner and power steering pump. Across the bottom left to right harmonic balancer(crankshaft) water pump, a/c compressor and the air pump. Hopefully you will be able to determine what one you are looking for. Bill