Front motor mount replacement 94 Integra GSR

In the process of prepping for a clutch replacement I found that the two front motor mounts are junk. Trying to remove the two bolts that attach the mounts to the frame, something broke off inside the frame. It feels
like the bolt screws into a blind nut that has been welded to the frame and the nut has broken off. Anyone have any experience in how to attach the new motor mount with these blind nuts broken off? It also looks like the only way to remove the mount now is to cut off the bolt. Wonderful Wisconsin winters and all the salt on the roads probably corroded the bolt to the nut making it impossible to remove.

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