hey there
there are 2 bars in the rear suspension on your car
the flat one runs from frame to frame above the rear end, the round one is called a PANHARD ROD and attaches to the axle on the pass side and the frame on the pass side.
ALL full size buicks, ie- LeSabre, Wildcat, Invicta, Electra, have this suspension setup from 61 to 64
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