PML part number 7086 and 9513 both fit the Ford Sterling 10¼" and 10½" differential. They have different shapes and fin patterns.
5.25 inch depth
Front cover has matching fin design
3.6 inch depth
Front cover does not have matching fin design
Benefits of both covers:
Level check hole: The level check hole for this differential is provided by Ford and is located on the driveshaft side of the differential housing.
Front covers available are:
PML part number 10816: this part also fits the Ford 10.25, 10.5 differential but is discontinued. See Part Number 10816 web page for reference information.