I need to change my valve cover gaskets, most importantly on the drivers side. These 7/16 head bolts have t- bars also. What kind of tool/ socket do I need to get the top ones off. Bottoms no problem. Their is literally no room to get anything on the head. I ground down a wrench but that doesn't work. I can't see where a swivel 1/4 inch would work either. If I ever get them off, I won't put them back on. I have a sizable leak coming from the rear of the drivers side and need to stop the bleeding. Any suggestions would be greatly appreciated.