have not made it or had the original but got this recipe from another board somewhere which is close and pretty good they said - I'm thinking of adding it to my next couple brews. I'd replace 10lbs of the 2 row with 6 lbs+ DME or whatever to get it to target and mash 2 lbs 2-row with the rest - actually probably up the other grains to 1 lb even as well for a partial. have not dropped it into a calculator yet to be exact for you but it is a good start FWIW.
Recipe : IPA, Goose Island Clone
Batch Size (GAL): 5.00 Wort Size (GAL): 5.00
Total Grain (LBS): 14.25
Anticipated OG: 1.065
Anticipated SRM: 10.6
Anticipated IBU: 77.5
Brewhouse Efficiency: 75
Wort Boil Time: 60 Minutes
Grain/Extract/Sugar
% Amount Name Origin Potential SRM
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84.2 12.00 lbs. Pale Malt(2-row)
5.3 0.75 lbs. Wheat Malt
5.3 0.75 lbs. Munich Malt(2-row)
5.3 0.75 lbs. Crystal 60L
Hops
Amount Name Form Alpha IBU Boil Time
-----------------------------------------------------------------------------
1.30 oz. Centennial Pellet 10.50 58.3 60 min.
1.35 oz. Fuggle Pellet 5.00 13.4 30 min.
0.75 oz. Fuggle pellet 5.00 3.9 15 min.
0.25 oz. Cascade Pellet 6.50 1.9 15 min.
Extras
Amount Name Type Time
--------------------------------------------------------------------------
1.00 Tablet Whirlfloc Fining 20 Min.(boil)
Yeast
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Danstar Nothingham Dry