Boston Birks in Mink size 37

Boston style Birkenstocks in color Mink size 37 soft bed regular fit. Gently worn, as they were a gift (12/2023) and realized I need the narrow fit. I have sprayed them with weather protector and sealed the cork on the heal as I do with all my Birks please no low balls I’m going to loose money and just want to purchase narrow fit