I have the early model 48" deck for the QT series tractor. I has the single wheel on each side at the back outside of the deck with the deck height adjusting attached to it. The newer deck has the roller in the center behind the deck. I need to know the outside diameter of the wheels. Mine have been replaced with larger wheels I am sure. They are about 8" diameter with a tractor lug on them. The part number for them is 1719381. If anyone has this deck for the QT I would appreciate knowing the size of the correct wheel.