15 to 21 is the same mold btw
They carry Leer & ARE shells, look up their websites for the models that are available for your Colorado. If they haven't gone through a new design, and are similar to 2018 model, don't think you will have a problem. There are monthly coupons for Leer that can save you some money. Good luck.
They do shells for all trucks; they are made specifically for your truck when you order it. It took three weeks from ordering to pick it up.
I'm sure they do. Call them
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