Is it the bolt toward the rear of the car or the front?
Im praying for your sake you say rear....Rears are a no-brainer...
Fronts however are a B*TCH, Mine snapped, I spent HOURS cutting that extremely hard bolt off, then a bit more time maneuvering the broken top half out through what small ammount of space I had.
On top of that, I guess I hit my horn too many times with my hands when sawing, So now my horn sounds like a hunda