I don't know enough about that toilet to tell you which is the set of bolts that actually go on the flange...you'd have to remove it to see. 11" would not be enough for a Promenade, but if the forward ones are the ones attached to the flange, it looks like it may be a 14" rough-in. I think the Promenade is one of those that uses the Unifit adapter, and if so, and it's 14", you'd need to also buy the 14" Unifit adapter otherwise, the toilet would sit out away from the wall (which won't hurt the toilet, but you may not like it!).