"knuckle" bushings 1994 Cadillac Deville 4.9L

1994 Cadillac Deville 4.9L Automatic Front Wheel Drive approx 150,
Ok this car has BAD sounds from the rear almost impossible to drive in a
straight line a local mechanic said it needed at least "knuckle" bushings
on both sides however shop would have to replace many other parts
because of policy for $1200.00 however they claim "knuckle" bushings
can't be found even in a junk yard allthough their 'quite inexpensive'.
As a third party (after many months) I was asked to find these "knuckle" bushings at any cost could someone give me a
proper part name? I could not see part myself when they stopped by
today. The lady owner of this car really needs to have this fixed Asap!
Thank you.