The upper two bolts to the fixed bracket are engine color, although they might have a scratch or two from installation. They were installed as part of the water pump installation at engine assembly, removed for the bracket and reused for the bracket. The lower bolt, 43000-S8 3/8-16X1 1/4 hex place, to the adjustable arm is clear zinc, and is the same as the adjustable bolt at the alternator. The washer, 352981-S8 3/8FLW, 0.406ID, 1.00OD, 0.125thk, at the alternator is also clear zinc plated.
Jim