Air Lift Ride Control Replacement Air Spring / Bag: If you're looking for a replacement Spring / bag for your Air Lift Ride Control Kit, you've come to the right place! Please keep in mind that these are replacement bags / air springs for Air LiftRide Control kits, meaning you already have an Air Lift Ride Control Suspension kit that needs a replacement (due to damage, loss, etc). The part number for this Air Lift Replacement Air Spring is 50291. This is a replacement for 2000-2006 Toyota Tundra (NON TRD Only) models.