The measurements that you're seeing have to do with the usable crossbar space. The Inno bars come in different lengths and they will work with your 2018 Toyota Mirai. I recommend going with the longer set because it gives you the most room for mounting accessories. You will need the following for the Inno roof rack:
51" and 54" Crossbars - # INXB130-138
Inno Through Feet - # INXS250
Fit Kit - # INK465
Attached is a review video for you to reference for the installation. view full answer...
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