what should i buy to fix it right.

One popular option is convert to coil springs and do away with all the height sensors, control module, air bags, compressor. You will... almost ...have the same Lincoln soft ride and no worries about all those complex electronics, air lines, which possibly will begin to fail like dominoes in a 17 year old car.check out: http://www.suncoreindustries.com/lincoln-town-car-suspension-diagram.php

front suspension and steering components Town Car

here's a few choices~

here's the bellows...they ain't that much money~