You can use this link to find and compare part numbers: https://www.catcar.info/ford/?lang=en

The part number for the bearing carrier for the 253 mm discs is 6146626
The part number for the bearing carrier for the 273 mm discs is 1637603

The part number for the 4 stud hub is 6156880

I'm not sure what that eBay seller is saying, but I'm 100% sure on the above.