Depending on which bolt you brake the head off of these are all good solutions...one of the easiest ways i believe is this....
all bolt holes/ nuts that these said bolts thread into on hondas,acura basically any car your working on are welded at 3 of the 6 corners...
this being said take a Die grinder (preferably) or chisel to the weld to remove them....
after thats done take a punch or fillips screw driver and a hammer to knock out the remaining bolt end (if needed to loosen rust use PB Blaster)....
replace with a factory bolt and a 14mm nut( you can re-weld the nut if wanted )

This can be done to the 2 bolts closest to the brake assembly. The bolt on the sub-frame may need to be cut one more time. In order for it to be removed fully. do to its length.