If what's currently on is an 8.8 (and I can't see any reason it would be anything more), then an A4-80 bolt is almost identical strength and a good replacement.
Not looked to see what the crash structure is made from, if it's steel then be careful that you don't shift the rust from the bolts to it...by using stainless into unpainted steel you'll set up a little electrochemical cell (a battery) and the steel will rust.
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