57-64 same third member, of course housings changed due to wide track, and leaf, coil spring changeovers, 55-56 isn't the same third member.
Maybe a little known fact, 58 (pre wide track) will bolt into A bodies on the lower control arm mounts, but you have to fab the upper control arm mounts. Other than that it will fit. The early funny cars (64) sometimes used that swap.
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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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