Some 1911 manufacturers will know which front sight they installed, and some manufacturers will replace it (not all).
Not knowing which 1911 you have, there is a specific formula (and I found one in a Kuhnhausen book on the 1911) used to determine the height needed.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)