For record purposed, some pics of my early 6 spline Aisin hubs loosely fitted to my '70 FJ43 I am restoring -
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Thanks to @Voodoocruisers I now have a set of those elusive early units. It appears one may have been busted and welded at some point as the cover has some weld on it. Happy to add these to the collection and the search continues for other obscure units.