The earlier open face alternators for 1969-70, including the 902, 903, and 904 were 6 spoke. For the 1971 model year including the 927 and 928, they changed to five thicker spokes.
Also, from what I have seen, the fans and pulleys were both silver cadmium.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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