if caliper using prelude then most likely the rotor oso using prelude...
HERE u can find ALOT of info on comparison for EK9/Prelude brakes and r32 n r33...
as for worrying about brake pad slip out... if it does.. ur not installing it properly...
besides... i already showed u proof that it can be done.. that EG belongs to a friend and i confirmed with him a long time ago that hes using 282mm prelude rotors with skyline 4pot.
why i confirmed with him? coz i oso interested to do the same setup.. already got my silvia 4pot calipers (got them cheap) and already using the 282mm prelude rotors...just no marnee to go pasang only.
instead of worrying too much...how about going to find out how the rotor fits into ur car... find that swift again and ask about the rotors and rotor installation.. once u get the rotor installation sorted... the caliper install shouldnt be much of an issue.