The early 1.8 diffs were bolt-on shafts like the early 1.6, but they have different PCDs (don't ask me how I know, driveshafts are still a bit of a sore subject as far as my car's concerned).
I have never heard, or seen, anywhere, a 1.8 with the smaller CWP diff as OEM standard. Even the later (detuned) Euro mark 1 1.6 had the same diff as the 1.8 AFAIK...
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