Stainless steel bolt kits.

Great tech info listed in the above posts. My M8X1.25 (slightly larger than a 1/4X20 bolt) 304 SS bolt that was holding a ProCharger bracket is the bolt that snapped. It would be the bolt located at the bottom of the pic, so there’s quite a bit of leverage and force on a relatively small diameter bolt. It snapped the second I put minimal pressure on the Allen Key to remove it.
Ultimately it’s a bad combination of a brittle SS bolt and galling of the cast aluminum