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@bq
753 could be had in 27.0 and 27.2 seat tubes. And other sizes too.
If a 27.0 fits and is snug, use a 27.0. 753 can be paper thin in the middle, and doesn't take well to being forced.
If you posted a photo of the seat binder part perhaps it would help us work out whether it is deformed from being tightened around a too-small post or whether it could be prised open.