What is the difference between a right-hand and left-hand bath?
When looking at a whirlpool or bath, you must establish the reference point, which is the entry side or threshold. From the entry side of the whirlpool or bath, the drain location determines whether the unit is right-hand or left-hand. An right-hand bath has its drain on the right side and a left-hand bath has its drain on the left side.
What is the removable apron option?
The apron or skirt, covers the front of a bath or whirlpool. A removable apron allows limited access to the pump/motor and to plumbing system components on the apron side of the unit.
The bathtub in my home measures 58" but I cannot find a STERLING bathtub for that size?
The standard size for bathtubs is 60" and are installed in the rough stage of construction (against the studs). After rough installation a 1/2" of wall board and a 1/2" of tile is typically added on top of the studs at each end of the bath making a finished installation roughly 58".