Small Spring Isolators

High-Performance NVH Suppression for Mustang II Lower Control Arms

Refine your front suspension with Fatman Fabrications’ specialized small spring isolators. Specifically engineered for use with Mustang II Lower Control Arms, these isolators provide a precision interface between the coil spring and the control arm, ensuring a quiet, stable ride for your street rod or custom project.

The Delrin® Advantage

Unlike standard rubber or soft urethane that can degrade or compress over time, these isolators are injection-molded from genuine Delrin® plastic (acetal homopolymer). This material is ideal for Mustang II suspension setups because:

• Zero Compression: Delrin is incredibly stiff, meaning it won’t "mush" under load. This keeps your ride height consistent and your alignment settings accurate.

• Low Friction: Known for its self-lubricating properties, Delrin allows the spring to seat and move without the annoying squeaks and binding associated with rubber.

• Extreme Durability: It is highly resistant to road salts, oils, and temperature fluctuations, ensuring these are likely the last isolators you will ever need to buy.

Precision Fit & Dimensions

These isolators are designed to fit perfectly into the circular spring pockets of Fatman Fabrications Mustang II style lower arms.

• Outside Diameter (ID): ~4.25"

• Inside Diameter (OD): 3.625" 

• 1.5" Tall

• Spring Compatibility: Specifically designed to fit coil springs with a 3.625" (3 5/8") ID, a standard size for Mustang II performance and stock-style springs.

Technical Summary