K Member for A Body

http://i1284.photobucket.com/albums/a574/bandman1971/20140119_1212181_zps6fece356.jpg

http://i1284.photobucket.com/albums/a574/bandman1971/20140119_1212251_zpscbe137dd.jpg

http://i1284.photobucket.com/albums/a574/bandman1971/20140119_1212341_zps384e5609.jpg

http://i1284.photobucket.com/albums/a574/bandman1971/20140119_1214021_zps47428ad1.jpg

These are some of the things I received from the previous owner. What advantages does installing these parts have. Please school me because I am not very mechanical, but I want to be.