FD engine parts in my S5/s5
 

already searched and cant find 100% info

ok heres the brake down, i had a JDM S5, i rebuilt it, now its dead, took it apart the ends of the rotors where the apex seals sit are worn and that ended up cracking and braking the corners of the main seals on 2 seals. so my rotor housings are gone. irons are over worn as well.
new parts/used parts:
my new FC came with a good set of S4 TII housings and irons, in mint shape. so i ported them using FD street port template all is well. now my old S5 eshaft has small groves around some areas and i can feel a lip where all the bearings ride so i think its time to part with it. the eshaft i have from my new fc looks in good shape by i noticed theres some rust on the front stationary bearing surface. not sure if i should clean this up with 2000 grit wet sandpaper and oil, or go for an FD eshaft.
as for rotors i have a new set of bearings i got for the FC but im getting S6 rotors now.

heres the ??'s
1: can i use the S6 rotors in s4 housings ( i read year all over and 2 ppl say no u need to re grove the apex seals area??) i have R/a super seals for 13B BTW

DO i need to mod any thing for those rotors?

2:can i use the FD Eshaft with my front and rear S5 stationary gears (i got new 3 window bearings for them and they are already machined for the 3 window) cant find info on this one, (i think this eshaft is lighter as well? )

thanks

You need S6 rotors,front counterweigth,front stack(stat gear,bearing plate,needle bearings)and a fd or S5 flywheel or if you are using a aftermarket unit you need a fd or S5 fc rear counterweight.No need 2 mods the rotors.

perfect thank you its kind of what i figured i would need thanks Saves me loads of headaches!