There's no easy way out with this. The engineering way would be for a machine shop to make you up a completely new part that you could weld into the hole after cutting the old one off and drilling out the stub. Welding at the rear of the bracket would have to be good and having some tacks on the outside would also be good. They could be smoothed out so as not to damage the bush. Crudely this could be done with a plain shanked grade 8 bolt and some washers, again welded in. This is a critical part, so best not compromise.
At the body end of the rod, unless you are racing this bush is best left as original, i.e. rubber. It is the same bush as the front suspension upper, inner cotton reels. Same bush at each end of the rod. Not very tough now days but poly in this position on the Panhard rod can cause shocks to be harshly transmitted into the body. At worse you can hear and feel it. Poly generally good, it's a matter of taste, but in this position I'd think twice about fitting it. You may already be aware of this and won't be fitting one there but just saying.
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