Looks like the part that's broken is 30044 on the diagram. I think your going to find that those bolts are welded to the small plate. Your going to need a new part or get the old one out and grind the welds to get the bolt out. Hopefully it's just tack welded. Have a new bolt welded in. I would suggest you replace both sides with new parts. If you decide to fix just the broken side and replace the broken bolt, do your self a favor and replace both bolts not just the broken one. Also find and use some form of corrosion preventative when you reassemble like Tefgel or lanacote.