Need PART for 1994 Buick Roadmaster Wagon - Please HELP!!!

If anyone knows where I can find these parts for my 1994 Buick Roadmaster Wagon, I would really appreciate it. This weekend, the FAN BELT TENSIONER and part of the MOUNTING BRACKET completely broke off. This car has 2 belts (the serpentine and the fan belt). I ONLY need the tensioner and bracket for the FAN BELT. We have looked locally at several junk yards without any luck. My car has the LT1 350 engine and there might be some other 1994 GM cars that have these parts. Please help if you have any idea where I can find these 2 parts. I love this wagon and I want to keep it going and going!! Thanks for taking the time to read this post. I look forward to hearing from some of you!!