Aisin Warner 55-50 SN Filter Differences

AW55-50SN and AW55-51SN is a 5 speed front wheel drive automatic transmission manufactured by Aisin Warner for Nissan, Volvo, Saturn and GM vehicles.

There are three different variation of filters for this unit.

The one for the Volvo and the Saturn does not have a rib (part no. A89010D) and the one for the Nissan has a rib (part no. A89010C.  The Chevrolet Equinox uses a different one (part no. A89010E).