I just had the same problem
I broke two extensions, I tried an impact, I even heated it.
the top one came off using a long pipe to get some leverage
the bottom one !!!!! I cut a big notch off the nut and tried to peel the nut off... It's that damn thread lock suzuki uses. they need to use a lower grade.
anyways i ended up cutting the bolt and getting a new one from a tracktor supply store.