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I'm pretty sure Fixwheelnut is correct. I have a frame with a modern sealed square taper BB. When it came to me it had Shimano cranks, which I changed to Campag. The LH crank developed a dangerous looking crack from the pedal thread, so I replaced it with a Stronglight that happened to be in the parts bin. All these cranks fitted on the same spindle with no problems.
Of course, you will need to have the correct length of spindle for whatever your set up is.
Hi @Fixedwheelnut.
Im trying to source an axle for my Stronglight 49D cranks, can you tell me the brand of the BB you are using with your cranks please. It may help me, it may not.