Spring Cup Weight Jack Bolt Combo ONE PAIR IMCA Modified Dirt USRA B-Mod Cups

Proper spring cup geometry is critical for consistent chassis performance and predictable handling in IMCA Modified and USRA B-Mod competition. This bolt-on combo eliminates guesswork during setup by providing precision-engineered components that work together to maintain accurate ride height and spring preload. Whether you're dialing in your suspension for track-specific conditions or rebuilding after a hard weekend, having quality jack bolts and cups on hand keeps your car competitive and your setup repeatable.

Kit Contents:

• Two 8" steel jack bolts
• 1-8 coarse thread pitch
• Two steel spring cups
• 5 inch outer diameter rating
• One pair included

Technical Specifications:

• Bolt length: 8 inches
• Thread specification: 1-8 UNC
• Material: Steel construction
• Spring cup OD: 5 inches
• Application: IMCA Modified, USRA B-Mod
• Installation: Bolt-on
• Fitment: Vehicle-specific (see compatibility guide)