AWD swap cutting subframe bolts

[mark4g63t]

Alright guys so i'm getting ready for my AWD swap and I can not for the life of me get the 2 subframe bolts that are nearest the rear seats. The problem i'm having is getting something down there to cut the top of the bolt free from the metal holding it in. I got the 2 that are in the trunk up fairly easily since they are close to the top.
Here are some pics of what i'm talking about.
How did you guys go about cutting these 2 out?
As you can see in the pic on the left that the bolt is probably 1"-2" down from the top sheet metal compared to the back bolts (pic on right)