In the process of building an engine, I want to replace all the hardware so the engine bay looks clean. I plan on using a2 stainless steel for the headlights, valve cover, fenders, and all of the plastic parts in the engine bay. My question is what bolts would be best for the oil pump, water pump, oil pan, rear main housing, etc? I know which sizes I need but I cannot find out what the factory grade is for all of those bolts is. Would the same stainless steel bolts work? Any help would be greatly appreciated!