It is called "generator power steering pump bracket", carries all belt tensioners and idler pulleys. It is one big bracket that is discontinued by Buick and no dealership carries [only found on year 1995 Riviera and older Buick and Oldsmobile models (series I); years 1996 and later carry two brackets, one for each tensioner (series II)].
Note: there could be a additional bolt behind the bottom tensioner; it holds the bracket against what looks like a ground extension.
Images (Click to enlarge)
Monday, February 11th, 2013 AT 8:04 AM