It's a funny thing but over the years I have seen many, many 2998 and earlier Speedies with one single notch and one double notch no.6 end link fitted, so much so that I have been thinking this is how they left the factory, but why that would be I can't imagine. My alternative theory is that when a spring bar broke it would be quite easy to lose an end link, and when you got a new one fitted it would be the slightly later double notch type, hence the mismatch.
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