Pro Comp 95-250FB 2.5' Rear Block Kit: Automotive. Buy Pro Comp 95-250FB 2.5" Rear Block Kit: Self-Leveling Units - ✓ FREE DELIVERY possible on eligible purchases. Pro Comp Suspension 95-250FB Rear Block; 2.5 in. Lift; 2 Cast Iron Riser Blocks; Pin Size 5/8 in.; . Authorized Dealer - 100% Satisfaction Guaranteed . Pro Comp Suspension . 95-250FB . Warranty: Yes . Rear Riser Blocks are sold in pairs. Never use a riser block on the front of any vehicle. . . .