Thinwall EMD 48" Radiator Fans (3 Pack) Late GP/SD38, GP/SD40 & Pre-1980 GP/SD38-2s & GP/SD40-2sDetails: The primary characteristic of nearly all EMD hood units is the roof top fans. Now you can upgrade most models from the GP30 to the end of the Dash 2 series with these components, which feature ultra thin top and mounting flanges, completely detailed hubs, motor supports and motor housing. The nickel silver grilles employ two layer etching to replicate the prototype assemblies. Application data is for as built units.