Auto Ventshade 15900 Rear Window Ventvisor Side Window Deflector Set for 1988-1999 Chevrolet & GMC C/K1500-C/K3500 with Extended Cab and Pop-Out Window Lets fresh air in and keeps rain out; Allows fresh air to circulate removing stale air and odors Reduces interior wind noise and mirror fogging; Allows window to be cracked, reducing heat build up in parked vehicles Precision-engineered and custom molded for an exact fit; Tinted, reinforced acrylic is UV and scratch-resistant No special hardware or drilling required, attaches with 3M automotive-grade adhesive Proudly made in the USA and backed by a Limited Lifetime Warranty