The Timbren SES FR1525HD model fits the rear applications for the 2WD and 4WD Ford F-150 and F-250 trucks from the years 1997 to 2004. It is designed to enhance suspension performance for towing and hauling.
$75 O.B.O. Price is $345 from supplier. Will throw-in Haynes Repair manual 1997-2003 and a roll of Pro-Form Pickup Truck/Camper Cap Tape 1 1/2" X 3/16" X 30 feet - for free (worth about $80)