So … I finally got my Fiero back from a known car service that caused disappointment. They misplaced many small parts including a lot of nuts and bolts and now I am on my own trying to get this Fiero back together.
Can somebody please tell me specifically what nut size is required for this part? I’m trying to connect the negative battery to the engine block however I tried the M10 Nut 1.0 1.25 & 1.5 and none of them fit! Image below:

Also, I need to know what size bolt & details this is featured. I’m trying to place the engine hook & belt protector back on. Below is an image of the bolt that that I need.

Thank you for your assistance.
[This message has been edited by MERATIME (edited 03-19-2025).]