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The aluminum arms are all the same barring some cosmetic differences (bump stop location). It's tough relying on the part number because the difference in track width is in the hub, and they can be interchanged between the late alum arms and the early. Visually, the late hubs have much higher offset (stick wheel out more) and has three prongs around the center nut that is machined down in diameter to match the hubcentric wheel.
NA or Turbo caliper work on either arms with the correct rotor:
a) Low offset arms (86 style hub) - Use 86 944T rotor and caliper, or 86 944NA rotor and caliper
b)High offset arms (87+ style hub) - Use 87 944T rotor and caliper, or 87NA rotor and caliper.
Cheers,
Lanner
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