FWIW, I've had many of the 8.2 rear axles apart and haven't seen plated bolts such as those. I have however have re-used the cap bolts over when changing ratios etc. without any problems. When those differentials break it's not the bolts that fail, about anything else but the bolts fails, housings, carriers, gears etc. the bolts aren't the weak link normally.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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