Silly surprise when servicing belts Options

[HectortheRican]

Yesterday, I crawled under the Celi to change the oil and replace the drive belts, then I ran into some issues with the PS belt. I loosened the bolt which fastens to the pivot slot on the bracket, and the bracket just fell off. Looks like the dudes who installed my engine after it was rebuilt never bolted it back to my engine. Instead, they cranked on the bolt that holds the PS pump to the pivot bracket on the crankcase, which kept the pump from moving....

So I was going to make a trip to Home Depot to get two bolts for the bracket so I can actually tighten the PS assembly on the slotted bracket how it should've been, but then I thought about material properties and wondered if the bolts I were to get from Home Depot were capable of withstanding the heat that the engine produces. I'm not worried about the stresses on the bolts since they'll just be holding a bracket to the engine - it's not like a motor mount bolt. The heat is likely a nonissue, but I thought I'd run it by here first. What do you guys think?