need help identyfing part.....

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I'M HAVING A HARD TIME FINDING THIS PART FOR MY CAR... SO MY VEHICLE HAS TO BELTS... SO THAT MEANS THERE ARE TWO TENSIONERS WITH TWO PULLEYS... ONE PULLEY TENSIONER U CAN ACCESS WHEN U OPEN UR HOOD.... BUT THE OTHER U HAVE TO REMOVE THE TIRE TO GET TO IT N U CAN ALSO SEE THE BELTS<-----THAT TENSIONER LET'S THE PULLEY SLIDE UP N DOWN. WELL THAT BROKE ALONG WITH WHATEVER WAS HOLDING IT UP(TO ME IT LOOKS LIKE A BRACKET THAT HOLDS THE TENSIONER N THE PULLEY N THIS OTHER BIG PULLEY) BUT WHEN I WENT TO TAKE IT OFF I NOTICED THAT THIS PULLEY IS CONNECTED TO A BIG BRACKET THAT LOOKS LIKE AN UPSIDEDOWN J LOOPED AROUND A BIG PULLEY WITH MULTIPLE SCREWS.... PLZ HELP CAN'T FIGURE OUT WHAT THE PART IS CALLED..... THANX!!