'91 Regal sways like a drunken sailor
 

I just inherited a '91 Regal Custom with only 53,000 miles on it. 4 door, 3800
v-6, automatic. Problem is that it leans in corners and is very loose.
looking for a swaybar for the rear end, similar to the F41 unit on Chevrolets. Any help in locating a unit like this would be greatly appreciated, used or inexpensive. Also, any suggestions on eliminating alternator whine in factory radio? Power antenna does not raise and lower, but I can hear the motor when turning off key or radio. Suggestions? Thanks for any help you can give me.:confused: