this is an factory aluminum differential cover from newer Ford 10.5 Sterling axle which direct swaps onto older 10.25 Sterling axles. i painted this one black. its commonly available online, i ordered mine from ebay for around 60$. it does require new longer bolts because it is thicker

Ford part #: 8C3Z-4033-A

Owner caption August 2016 · Photo 93 of 426