I don't know why this doesn't fit other S197's, but the part number works for 2010 V6 and GT Mustangs. I bought it new from AM for $400. Ill let it go cheap, let's say $200 +actual shipping.
10MustangBBKName by Kenneth Stephens, on Flickr
10MustangFuelPumpOpen by Kenneth Stephens, on Flickr
10MustangFuelPump by Kenneth Stephens, on Flickr
10MustangBBKName by Kenneth Stephens, on Flickr
10MustangFuelPumpOpen by Kenneth Stephens, on Flickr
10MustangFuelPump by Kenneth Stephens, on Flickr