The ATI damper is specified for Ford Coyote 5.0L engines and is listed at 6.78 inches OEM size (SK1473) with 6 and 4 groove configurations and an AC pulley kit. It's presented as a direct-fit crankshaft damper assembly intended to match OEM dimensions while supplying the pulley configuration and fitment needed for the Coyote 5.0L accessory drive layout.
ATI Ford Coyote 5.0L 6.78in 6 & 4 Grv Damper w//AC Pulley Kit (OEM Size SK1473)