Taken from Rough Country:

"Has the rear of your vehicle started to sag, or are you looking to add a bit of lift height? Whatever the case maybe we have you covered at Rough Country. Upgrade your rear suspension with Rough Country's vehicle-specific block and u-bolt kit!

• Blocks
• Made of fiberglass reinforced nylon for superior strength and durability.
• Tapered to reduce drive shaft angle.
• Single 9/16-inch pin blocks.
• 2.5-inches wide.
• U-bolts
• Thread Size: 9/16-inch
• Inside Width: 3.25-inch
• Inside Length: 10.5-inch
• Style: Round
• E-coated black
• Corrosion resistant

Estimated installation time 2-3 hours."