1990 Mack Midliner Series Helper Springs
- Timbren®SES Rubber Helper Spring KitMack CS200P Mid-Liner / CS250P Mid-Liner / CS300P... 1990, SES Rubber Helper Spring Kit by Timbren®. This SES Suspension Upgrade fits the rear suspension truck. Each laser cut piece of steel is precision bent and powder-coated to ensure...Improves ride and handlingEliminates trailer sway and roll$496.65 - $1,428.36