I have a Kohler toilet that I want to replace with a Toto. The bolts are 12" from the wall, but there is a radiator behind the toilet that extends out 3.5". The back of the current toilet has a curved area that actually touches and pushes the radiator cover in very slightly so it is a tight fit. I can tell that I will not be able to use a skirted model but can you please advise as to what model would work. The Promenade looks the closest as the back is inset from the base, but I would like G-Max if possible. Thanks for any advice. I cannot move the radiator.