Stems usually have bolts with smaller than standard heads. I’m about to have the same problem; I’d like to replace the horrible rusty bolts in the stem on one of my bikes for new stainless ones, but I don’t know where to get them from.
You may find something here
https://www.stainlessautomotivefastenings.co.uk/index.php?main_page=product_info&cPath=565_123_107&products_id=4447&zenid=7k71ro18fn1t06idv2rili8t95
@freezing77 started
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Stems usually have bolts with smaller than standard heads. I’m about to have the same problem; I’d like to replace the horrible rusty bolts in the stem on one of my bikes for new stainless ones, but I don’t know where to get them from.