I finally found one on Ebay last month, but still costed $175 due to shipping from Florida. Try the link below and search on Gas Tank with your zip code. Call some of the listed places that have gas tanks avail. and see if the shield is usable and avail. You might get lucky. The one I bought came of a GX470 but exact same part.
Good luck and be ready to drill those broken bolts out of your frame rail.
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