CAB bolt broke in frame

[KEVORM]

i would think with plenty of PB blaster or WD-40 a left hand drill bit and an easy out you should be able to get it. Good luck, sheared bolts are no fun :(

[gtdragon980]

Well, as the title states, the bolt for the cab broke off as I was tightening it with a impact...

To make matters worse, I found out that the PO also broke a bolt off in the second hole, so I have no way of mounting my CAB at all. So, I'm going to attempt using an extractor to remove it, but if it does not want to back out since it is really rusty, I'm going to have to drill it out. Doing so may screw my threads up and I will need to heli-coil the threads. My question is, does anybody know what size heli-coil I should get for this particular issue? I know its an m10, but I need to know the length of the hole for how long the heli-coil should be, and I don't have any means of finding it out as of right now. Thanks in advance!