Hi, All.There are external "easy outs" that grip the outside of the bolt that have worked okay for me. Heat the remains as much as possible and lots of Kroil, PB Blaster etc., a modicum of luck, and a clean and trouble-free installation can be yours. I'd also use some anti-seize on the cleaned up threads. YMMV.
Good Luck Fred Moir Lynn MA (In the Rust Belt) 84 190D 85 190TD 87 190Dt