The differential cover is on special because the cover is an old style.
Since it is an old style, the differential cover has one less fin.
For reference, see our regular Front Differential Cover, 12 Bolt For 2013 and Newer Ram 3500 and 2014 and Newer Ram 2500, PML Part Number 11136.
This special should fit and function like a regular part.
This is sold as-is and cannot be returned. Please call to order.
Top view of differential cover:
Inside view of cover: