2011 is early for the suitcase kit. What model exactly do you have? If it is the 3570.50 then it never had any extra straps at all, those came in with the suitcase model, which as you say had 2, but the presence of otherwise of those doesn't really make a massive difference on a non LE model. I don't think you would recoup your outlay if you added one, they are very expensive. Its a different story on an LE where a full set can be vital and lack parts of which can knock 10-30% off the value.
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