Most likely the manufacturer was the same for all the caps and inserts and decided to roll two part numbers into the later one.GMH didn't always check 100% on deliveries and the manufacturer could have just bumped it through. As Dr Terry mentions they often made a supersession, but for smaller items with minor changes they just accepted the changes if recommended by the supplier.. Don't forget that the once the parts became spares and total supply went to Dandenong (HSPO) they had their own buyers and quality department. There were many factors in place that saw many H series parts suppliers changed, parts deleted and then reinstated a couple of years later. An upheaval was more than just a bit, it was substantial.
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