I have not gotten the total from the company making the kit as they want to go with a different caliper now that I wish would of been done with the BBKs that first came out, the Super Lite. More clearance though the specs made it seem the same it must be in the critical area where all wheels step down on internal diameter closer to the spokes. He is looking for a complete "spindle assembly" in good shape off a wrecked car which will be the knuckle, hub, bearings, etc...
For now the 11.75, Dynapro set can be ordered, they are not a vendor here yet, racingbrakes.com, tell them Rick McCallum, RAAMaudio sent you.
With the 11.75" GT rotors this is a very solid track ready brake kit, race ready with cooling.
Not sure who got the idea first but I spent a ton of time and money getting the first setup I made to fit the 6ul wheels, I should of started over with the Super Lite which I was working on that long we before we talked about it, Brian at RB thinks he can fit the 12.19 rotors under 15's with the SL caliper, if that happens I will have a new BBK once he has it worked out, my car needs all the brakes it can get as it is very fast on track
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I am very glad you are getting more of the 15x8 TDs in stock soon, the very best option for those staying with 4x108 and the BBK could be made for either or both bolt patterns, 4x100 and 4x108.