Ok, well I just wasted the night in the garage swapping brakes around to see what fits. Figured I'd post it and make it useful info for somebody. I wish I could think of a better way to organize this, but I just inhaled a lot of asbestos or something ;)

GSX (2-piston) caliper + GSX Bracket + GSX pads + stock rotor
= Doesn't work, gsx pads hang about 1/4 inch off the end of the rotor.
= Does fit inside stock 16" 5star wheels

GSX caliper + GSX bracket + GSX rotor + GSX pads
= Works perfectly in stock 16"s
= Must bend back or replace dust shield (you have to unbolt the hub from the axle to remove it)

GSX caliper + GSX bracket + AEM GSX big brake kit & big rotor
= Needs 2mm ground off the gsx bracket and the 2gnt hub
= Needs dust shield severly bent back or removed
= Needs at least 17" wheels, of correct offset.

GSX caliper does not fit in 2gnt bracket.

2GNT caliper will bolt to AEM GSX big brake kit.

You must have a GSX bracket to mount a GSX caliper and GSX pads.

There are (at least) 3 different kinds of GSX calipers
- 1995-1999 GSX, 7mm bleeder (8mm wrench), banjo fitting
- 1993-1994 GSX, 10mm bleeder (10mm wrench), flare fitting
- 1990-1992 GSX, Unknown, but is smaller, and has smaller pistons. Same size as 1990-1994 GST stock brakes

3000gt/stealth VR4/turbo uses 4 piston calipers and totally different pads and brackets. Only thing useful is the front brakes an from a nonturbo 3000gt SL.

Be prepared to round off the fitting on the factory hard lines. Use lots of liquid wrench. I had to use an air hammer against a 10mm openend wrench (ghetto impact wrench!) to undo it. You may want spares before you start. Front pair should be $10 total.

GSX Caliper rebuild kit: Raybestos WK2029 or Brakeware 66164, contains 2 rubber seals, 2 rings, and 2 boots. You'll need 2 packages. For some reason, Autozone lists this under 1993 Nonturbo 3000gt.

GSX pad retaining clips: Raybestos 15771 or Brakeware H5832, contains 4 metal clips that sit in bracket and hold the pads in place. You only need one package.

Factory OEM part numbers:
RMB 699 450 Remanufactured Caliper Kit LH (includes caliper, bracket, and bolts)
RMB 699 451 Remanufactured Caliper Kit RH (includes caliper, bracket, and bolts)
MR 493-985 Pad Set
MR 389-652 Shim Kit
MR 389-599 Clip Set

Get steel braided lines from www.roadraceengineering.com, $85 includes all 4 lines.

An "Unloaded caliper" is just that, the caliper and nothing else.
A "LOADED caliper" is the caliper, *the bracket!*, and pads.

Therefore, you can buy a "loaded" 2-piston GSX caliper, and return your 2GNT 1-piston caliper and bracket to get the core charge refund, and you have a nice new 2-piston caliper for about $120 each. You'll still need to buy the big GSX rotor too.

More info:
http://www.2gnt.com/www/files/ntprodbrakes.htm
http://www.roadraceengineering.com/eclbrakes.htm
http://www.dsmparts.com/Brakes.htm
http://www.3sxperformance.com/brakes.asp
http://www.jakelatham.com/1gDSM/projects/tce_brakes/index.shtml
http://www.vfaq.com/FAQlocator-brakes.html