I'm feeling a lot better now.
I drilled the tops out of the bolts. Have removed the fuel rail and injectors. Both the bolts had a jagged piece of metal remaining. To my amazement i was able to turn the remaining bolts out with light finger presseue. It must have been the tension from the fuel rail that made the buggers stick.
Anyway, plenty of thread left so I should be able to use standard replacement bolts.
I have removed the injectors (very easy to do, they just pull out) and will take them for cleaning tomorrow. $30 per injector.