Im no 240sx expert so forgive me if I'm wrong, but if the bumper I have for sale is a "chuki" style then yes, the lip will fit.

FYI - The lip and sides are brand new, never been installed, but we held it up on the car to get an idea of what it looks like.




The fenders, bumper, and lip were all going to go on one of our project cars, but decided on something else in the end.