This is the Air Injection Belt that is attached to the water pump.  For models for California, Australia, & Japan 1977-1980  Shadow II, T-2, Silver Wraith II 1980-1998 Silver Spur...

This is a pair of belts that run between the steering pump and the air conditioning compressor. 1966-1980 All Models and VINs 1980-1989 all Models up to VIN 27780     

This is the single alternator drive belt for all cars with a CAV alternator. 1969-1980 Standard Wheelbase Shadow, T-series (VIN 8742-41686) 1980-1986 (VIN 01001-17000)