These are 27 1/2". I think that 55 second series to 66 are the same, with some exceptions. I have seen different length long beds and always thought that the differences were the in the back end only and that the few that I saw that were in the front were customized, but now I don't think that. They must be just like the differences in a short bed and long bed, with the disfferences beeing in both ends of the bed. WES
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