Oh god. You can only do presses for triceps now. How terrible.
Dude. Don't worry about it. Just do the exercises you can do and get stronger at them. You don't need to isolate separate heads of the triceps. I'm pretty sure you can't anyway. Besides, if you did B-Jay Pullovers or whatever for triceps, you're probably not training them right anyway.
Do Bench Press, Floor Press, Incline Press, Shoulder Press. Just press. Don't worry about isolating anything. Listen to what I am saying: if you get a lot stronger all of the muscles on the back of your arm will be bigger.