The actual cutoff date would have been different for home or export, [especially into the US].
Your number isn't far away from what was quoted, where did you get your info from in the first place?
If it was Zhome, then some of the numbers they quote are a bit "rubbery'as they haven't taken local production into account.
In reality, one would expect a overlap in parts, a case in question is later model 260's imported into Australia, were for all intents a combination of the 280 and what ever was left over and couldn't be used in the US.
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