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To answer your original questions.
#1. All S13 subframes support 4bolt diff covers. Not sure what to tell you besides putting a 4 bolt cover on your diff.
#2 No z32 subframes are not interchangeable with S13's
Now for the newest question. I don't know what you mean. My stock s13 240 rear has a bulge in the cover and looks like the picture. All s13 covers that I have took notice to had a bulge.
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