I have been trying to figure out what read end is in my 71 lemans. 8.2 or BOP 8.5. It is dated for 71 so I assume it is the original (could be wrong). I’ve read that the square ears on the bottom mean 8.5 and that if it is even with the cover it is 8.2. Mine looks like it is neither. It’s not full square but it isn’t flush with the cover. Without taking the cover off is there a way to find out?