The AAON LL-060 package rooftop unit is of a different design then most obsolete AAON RTU's. It happens to be extremely similar to the new Lennox SGA 240RTU's which also have two coils stacked in a v configuration. Nationwide Coils has direct replacement condenser coils for this unit with standard materials of construction far superior to the OEM standards. With .020" Copper Tube Wall - .008" aluminum Fins - 16 Ga Galvanized casing these coils are manufactured to withstand the environment for years to come.