Hi Bob,
The 2106FBS is 21'-11", so it should fit. I would also recommend that you use a triple-cover system such as what I do. Figure on replacing the fly-over rain-break cover about three times per year.
My main cover didn't make four years, and I am now using a King Bird, which I really like.
Thanks, Eagle5
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2019 Minnie Winnie 22M on an E-450 frame