I am selling a front pair of Evo X calipers. One of them needs new seals (cheap around $10) They both have about 25k miles on them. All you need are these from Touge Factory
TF? Evo 8/9 Brake caliper adapter for Nissan S13/S14/S15 and they will fit on your s14 240sx, you will need bigger size wheels for them to clear.
Here is a write up to replace the seals.
http://forums.nasioc.com/forums/show....php?t=1600335
Apparently the seals are $48
http://www.frsport.com/Front-Caliper...FQqCQgod2H8AXw
$365 shipped OBO for both L and R fronts text me 201-259-8809