The toilet in our upstairs bathroom has been installed too cose to the wall. The lid to the bowl won't even go on completely because there is not any clearance between the back of the tank and the wall. I measured from the closet bolts (?) to the wall and it measured 11 1/2". What are my options for fixing this? Do I need a new toilet... or is there a different type of flange I should be looking into? I appreciate any advice.