My alternator mount has no “ears” It is a small piece of steel with 2 holes where it bolts on to the engine block and a hole that is threaded for the #10 bolt for the alternator. It is sort of a small “L “braket.the spacer is between the alternator and the bracket. (unless there is a “newer type mount??) The load is the weight of the alternator and the viberations from the engine. I don't think I could get good threads in the mounting block if I tried to drill and tap it for 3/8 ,,maybe I could helicoil it tho??