I've heard that before, but I find it hard to believe that is the real story.To prevent people from switching wheels front to rear.
I think it is more likely a new parts sourcing manufacturer was the rewal reason.
the original Stephens setup used Toyots spindles and hubs. Those parts probably were drying up and lotus made a change as they were going away from the toyota brakes, too. With Lotus being such a small volume manufacturer, finding already prioduced hub was more cost effective than having a small run of custom hubs made.
this is just a guess though......
the real reason may be no reason at all.... after all, these cars are British. :UK: