I think the only hub you could do is the 88-89 300zx front hubs to get five lugs, because 240sx and z32 front hubs are totally different. I just picked up a set of 30mm z32 calipers for mine. BTW the link posted has the calipers are not mounted in the optimum spot. Dynamics teaches us that there is always a normal acceleration when you apply your brakes. You need to swap your spindles so the brake mounts are opposite. That way the normal acceleration is pointing toward the opposite of forward motion, thus giving an extra free deceleration when braking.
Like how these are
http://www.takkun.net/dri-z-296.html
tbs