The Eaton Fuller Gear Spacer, part number 20578, is a genuine OEM replacement spacer for Eaton Fuller drivetrain applications. This spacer maintains correct gear positioning and axial clearance within the transmission or transfer case assembly. Because gear spacers are application-specific, the correct part depends on your exact unit configuration. Pro Gear and Transmission carries genuine Eaton Fuller components. Not sure this is the right spacer for your unit? Give us a call and we can help verify the fit before you order.FeaturesGenuine Eaton Fuller OEM part number 20578Also referenced as HF20578Maintains correct gear positioning and axial clearanceSold individually (each)Compatible with Eaton Fuller transmission and transfer case assemblies – call to verify fitment for your specific unit