water pump bolts that hold brackets finish

What color or finish is correct for the 3 bolts that hold the brackets to the water pump? Blue, black or natural?

Thanks. I'll remove the paint then!<img src=images/icon_smile.gif border=0 align=middle> I thought they looked funny with the blue paint on them over black.<img src=images/icon_smile_wink.gif border=0 align=middle>