Upgrading mounting hardware.

I would take a sample of the bolt's I want to replace to the hardware store and compare, they should be metric.
 
Contrary to popular belief, Stainless steel bolts aren't stronger that standard steel bolts!

Do what Greg58 said & take some samples to the hardware store & buy some good 'ol grade-6 bolts... (they're the ones with three lines like a Mercedes star on the head). ;)
 
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