If you buy a full set of brake pads and shocks is where the 20% off will apply. You can purchase brake pads from off the shockwarehouse website, simply add to your cart and the promocode should automatically fill into that field.
If you are purchasing just shocks then you would use the forum 5% discount ford5.
If you purchase shocks and brake pads in the same purchase you will receive 20% off the brake pads. This will show the discount automatically when you go to check out. You can use the 5% form discount toward your shocks. Use promo code Ford5.