I think they just have one BTO configuration for each model. From what I've seen so far, they are:
13" MBP
3.3GHz / 512GB / 16GB
15" MBP
2.9GHz / 1TB / 16GB / 460 dGPU
Interestingly enough, these "ultimate" models are both one step down from the maximum storage option. I guess they thought that the 1TB and 2TB upgrades for the 13" and 15" were too expensive even for the small segment of the market that walks in and requests one of these ultimate configurations.
how can you check if the stores have these config. I want the exact specs in the 15"