HELP needed with the bug
 

Guys, it's not often you see me begging for help as I wanted to try and sort the bug out for as much as I could on my own.

Problem now, I've got a turbo back system to fit and the back and lower bolts on the turbo heatshield had been rounded off by the previous owner.
I've spent the last 2 nights and about 5 hours in total trying to get then off with no avail.

Is there anyone with any expertise that can help a brother out? I don't care if I have to bin the turbo and but an uprated one.

Coffee, cake and bacon sarnoes will be provided :)

Maybe a long thin chisel and take the bolt heads off.