Parts like this Id go to Mazda dealer to get one which is exactly the same size and strength as original matching the other one too. Buying one bolt from your dealer wont cost you an arm and a leg anyway.View attachment 217722
I'm referring to bolt #9 in this image, just be clear. 17mm...do you happen to know thread and length? If I didn't lose one of them, I would take it to a hardware store to compare...