I did the same with my TBR7, I pulled the whole basket out, and using a drill and small drill bit, was able to drill into the bolt, from the front(not the head side) and as the drill bit, well bit into the bolt, it screwed the bolt out.
Once out, I bought new bolts at like a Lowes.
I believe the bolts' torque is measured in-lbs, I just hand tighten them with lock-tite.
It's what I did, hope all goes well.
