Sub frame bushings sizing?

Was trying to remove sub-frame bushing in the rear of the sub frame, driver side. Not the one closest to the firewall but the one closest to the transmission.
The bolt broke. There is nothing wrong with the bushing itself, I was simply wanting to loosen it bit to replace the one behind it, now I have a good bushing with a busted bolt.
The upper part of the bolt is in the screw inside the body, there is a bit of an access hole above the place where the bolt screws into the body, part of the bolt is in the metal part of the bushing assembly the other part in the body where it screws in.
What would be the best way to get that out? I have an idea in mind.
The car is up on ramps so I cannot remove the tire for better access.
The rear bushing on that side I've got a brand new one in and properly torqued but it isn't apreading out enough to catch the sub-frame so if I lower the car the sub-frame is wanting to slide right off the new bushing hence there is no support on that side but for the very front bushing up next to the grill and front bumper.