Folks - I’m going to resurrect this thread as I have now come across the self same issue. Ordered and received a pair of these GSJ268 ball-joints from Mini Sport here in the UK. As you can see from the pictures, they are pretty much identical except for the size of the shaft. The new ones are indeed 13mm at the top of the taper and 15 or so at the bottom. The stock item is 14mm top and 16-ish at the bottom. So these are the Metro Mk1 joints, which clearly aren’t correct at present. The taper doesn’t bind as an interference fit in the lower wishbone and even if it did, the threaded section is way too proud of the mounting face to tighten up.

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Has anyone found a supplier and part no. In the UK for the correct size replacement? Very depressing to find that the new ones don’t fit, having been very proud of myself to get the old one out using a 46mm open-ended spanner and a 5ft length of steel pipe frown

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Sorry about the twisted images - IMGUR is not easy to fly on an iPhone when you’re grumpy!