i put in a 98 cobra rear end with disk brakes on my 93 cobra a few months ago. this weekend i drained the fluid and when i went to look for the plug to refill the diff, it isn't there. i checked all over. it seems that its covered. i don't know what it is. the plug should be directly under/parrellel to the upper control arm. so i guess my options are to remove the rear end to refill, or? anyone have any insight, ideas on what else to do?