there is a special pliers that has a fork on one face and a poke on the other face. the fork straddles the rod on the flat bracket and the poke pushes the rod out of the bushing. A small amount of heat would soften the bushing but not too much heat!!!!
I have pried them apart with a pair of screwdrivers but finesse is mandatory. The bushings are available if you break it, but you need a good parts man to find it. NAPA maybe