I checked with Ford if part number LB5Z7855100AC fits the 2021 Ford Explorer and here is their reply.
14:30, Mar 29
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14:33, Mar 29
Info: You are now chatting with Mark.
14:33, Mar 29
Mark: Hi Dale.
14:33, Mar 29
Mark: Thank you for chatting with us, here at FordParts.com, my name is Mark. How can I assist you today?
14:33, Mar 29
Dale: Will part number LB5Z7855100AC fit a 2021 Ford Explorer Limited?
14:34, Mar 29
Mark: We appreciate you being a part of our Ford family, and I can definitely understand the need for this item.
14:34, Mar 29
Mark: Please give me a minute to look this up.
14:35, Mar 29
Dale: Thank you
14:36, Mar 29
Mark: Based on the vehicle information provided, the Luggage Rack Crossbars ARE listed as an option for the 2021 Explorer.
14:37, Mar 29
Dale: That's what i need to know.
14:37, Mar 29
Mark: Great! While this may not apply for this item, if you have not registered an account with us; please do when you see the pop-up box, that should have
appeared upon entering the site, for $20 off on an order of $75 or more. Currently we are also offering Free Shipping with a registered account.
14:37, Mar 29
Mark: Is there anything else that we can assist you with today?
14:38, Mar 29
Dale: Not today, thank you.
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Mark: It was my pleasure
14:38, Mar 29
Mark: Then I'd like to say thank you for shopping FordParts.com and chatting with me today. There will be a very brief survey at the end of this chat, with 5
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14:38, Mar 29
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a wonderful day. Stay safe and stay healthy.
14:38, Mar 29
Dale: Have a great day.
14:39, Mar 29
Mark: Thank you