Co-incidentally I read about this somewhere in GMH literature in the last week. Looking for something else and moved on. Now you've raised it I'll go looking where I saw it. Edit - found and attached the front page.
And whilst looking for it found something else out in the LX POA docs:
N66, the 13x6 steel "sports" wheels. Was replaced at some stage with N67, the 13x6 alloy jellybeans. It says that N67 was to be introduced as soon as possible after the introduction of lightweight calipers. There must have been an issue with LH style cast iron calipers and fouling on alloy 13" wheels. My 2/76 SL hatchback had N67 on it.
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