I use rivnuts for areas where nuts would be difficult to access. I have the astro pneumatic tool but there are cheaper ones.
https://www.amazon.com/dp/B003TODXQ...d_r=683f6054-ba9c-4cb5-9a89-d1b3d5280a5e


Mason

1947 Chevy 3100
-57 Chevy 235
-95 S10 T5 Transmission
-97 Blazer 3.42 Rear End