I Have A 1991 Sentra Se-R With A Gti-R Swap And Was Wondering What Kind Of Brake Kits Are Available For My Car.

Or Can I Just Use Another Nissan Brakes (ex. 300zx)

 

you can use NX2000 breaks... Commonly known as ADVF22's.

Or you can go all out and get the fastbreaks kits.... There are a couple options out there for you.

 

thats pretty much the only two.. the advf22's is pretty hard to come by, unless you buy all new parts.
which is quite expensive for what you get. (single pistons, slightly larger rotors)
and the fastbrakes kit, while expensive, is alot better, they offer two kits also, one that fits behind stock b14 wheels.