bought a Toto Promenade (party based on what I learned here) and am completely satisfied with it...however I need to change my 14" rough-in to 12" so it is closer to the wall...was aware of the mismatch when I bought the Promenade but went with it as it looks right in my old bungalow and a Toto with more modern styling (and uni-fit) would not. Anyway, would like to know what the best way is to adapt an new offset closet flange to my existing 4" cast iron waste line...and also which flange would be best for this application....TIA