Hey Businessman24, since you're working on the rear subframe, I highly highly suggest these.
Review: Whiteline KCA 349 Rear Nissan Sub-Frame Align and Lock Kit - SR20 Forum
They make a massive difference to firming up the rear subframe... without them you can really feel the rear subframe flex. I've had them on my car for 2.5yrs. They're the same as skylines, s13/14's. So i'm sure you can use any product thats available or cheaper.
Review: Whiteline KCA 349 Rear Nissan Sub-Frame Align and Lock Kit - SR20 Forum
They make a massive difference to firming up the rear subframe... without them you can really feel the rear subframe flex. I've had them on my car for 2.5yrs. They're the same as skylines, s13/14's. So i'm sure you can use any product thats available or cheaper.