The mounted feet are useful when the reducer does not have a square shape and must be fixed "to the floor", thus eliminating the need for side flanges.
They are not necessary for square-shaped reducers which, due to their geometry, can "stand on their own".
The feet are available as a separately mounted accessory only in certain sizes of reducers. Normally, for the larger sizes, the feet must be installed directly by the manufacturer.
Even if they aren't listed on our website, we probably have the spare parts you're looking for. Let us know the quantities and we'll send you our quote!