Replace Firestone Ride-Rite Air Helper Spring Kit Rear 99-04 Ford F250/F350 (W217602550). Replaces dealer part numbers: W217602550. Price is for 1 set. Direct replacement, plug & play. Built to strict quality control standards. Brand NEW fitting for the following years and models. Fits F-250 Base 1999. Fits F-250 Lariat 1999. Fits F-250 XL 1999. Fits F-250 XLT 1999. Keep The Vehicle Level. Air Adjustments Improves The Ride. About us: We are focusing on Auto Chassis Parts since 2001. Through a decade of doing business with a great number of customers, we are able to provide the best products and service to you.