Black Coupling (92) 1-3/8", Driver-Side (Old Style Configuration).  1-3/8" Top Shaft (Gearbox-End) and 1-1/2" Bottom Shaft (Brush-End).  This coupling is an Older Style Coupling used on Galvanized frame systems. "Newer-Style" Aluminum frame systems use 1-7/16" Couplings (#766-1000) and Reducers.
            
        
 
             
                 
                 
                 
                