That mount should be simple to order call the parts store. Fixing the broken bolts and hole is another whole problem. Without seeing what your talking about I can only guess. If the bolt hole is in an open flat part not the engine block. You can drill it and put a new nut on the other side of the plate. If however it's a hole in a part like the engine or frame where you can't put a nut on the other side of the part. You will need to reap the hole or cut new threads. Some holes you may not be able to reach and pulling the engine is or may be the only chance to fix the issue. Remove the part that needs to Be replace and clean up what you can. You may have to lift or jack the engine up to remove the mount. And sounds like you will need help if not have. Shop do the work for you.