Pull the 2 good bolts and take the pulley off and then get ready to use good condition or new vice grips...

Unless they ended up cockeyed from getting snapped off you should be able to turn them even from the back if they protrude enough.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course