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Hi there -- a Twin XL mattress is the same width as a normal twin (39") but is 5" longer (80" instead of 75"). You can see the details on all mattress sizes here: https://www.goodbed.com/mattress-sizes/ As such, you are correct that two Twin XL bases will not fit inside a Cal King bed frame. They also will be too short. Oftentimes though, you can use a King size bed frame with two Twin XL adjustable bases. I hope that's helpful.
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