I'm looking to buy some GSX front calipers. Any condition. Let me know what you have!

This is what I did... could save you some money.

Just go in and buy some new ones at AutoZone. They won't set you back much, and when you take the cores in just give them your originial front brake calipers. They don't know the difference. I think that I payed somewhere under $100.00 per caliper, brand new. Don't quote me on the price though.

Built block.
Refinished head.
Tuned suspension.
TURBO.

Keep your eyes out for 3000GT base/SL calipers as those work too. They use a non-banjo fitting however.

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2012 2500HD LML

which are bigger? The 3000GT or the GSX?

Built block.
Refinished head.
Tuned suspension.
TURBO.

They are the same size.

Take the advice of bzoss, go to autozone pay for he GSX calipers and cores (I ordered red powder coated bendix ones for my car all the way around), then turn in your single piston RS calipers. They don't know the difference anyways and the likely hood of you getting the same guy that you had before is unlikely. They will just check to see if the core is in there or not. I can tell you tips on how to get stuff by automotive retail stores as I used to run one of the major ones.

I have a set that's just been rebuilt with all new hardware, etc. PM me if interested.

You can also run the TT 3000GT brakes if you wanted. I've got a set of those calipers and pads, but you'd need the adapter bracket and 17" rims to clear. They are 4 piston.

So where would you find the "adapter brackets" at? Also, what size are the rear brakes, are they bigger also?