Kit Includes: 2X Rear Strut &Amp; Coil Spring Assembly Conversion Kit - 99911 2X Front Strut &Amp; Coil Spring Assembly - 171341 Fitment: **Converts Your Air Or Electronic Suspension To A Standard Suspension** Replacement For 2002-2006 Gmc Envoy Xl (Rear Air Springs Or Rear Coil Springs) Replacement For 2004-2005 Gmc Envoy Xuv (Rear Air Springs Or Rear Coil Springs) Replacement For 2002-2006 Chevrolet Trailblazer Ext (Rear Coil Springs) Replacement For 2003-2006 Isuzu Ascender (129 Inch Wheelbase; Rear Coil Springs) Introduction: Detroit Axle Suspension Components Are Manufactured To Original Equipment Standards And Provide A Superior Stopping Performance. We Are A Leading Supplier Of Ride Control Products To Oe Vehicle Manufacturers Nationwide, That Expertise Translates To Detroit Axles Oe-Quality Aftermarket. Suspension Parts Are Built To Exceed Oem Specification. Undergo Impact, Wear, And Fatigue Testing To Help Ensure Quality And Durability. With Over 30 Years Of Experience, We Are Proud That Millions Of Customers Around The World Rely On Detroit Axle Parts. We Have Two Metro Detroit Storefront Locations On The North And West Sides Of The City. Our Flagship Location, In The Heart Of Detroits 8 Mile Road, Is A Combined Retail Storefront And Over 180,000 Square Feet Of The Warehouse That Serves As Our Global Distribution Center.