For the Irvine ISD RV Slow Retract Shower Screen Door, use the narrower width measurement of your shower opening to ensure a proper fit. Since your opening is 33 inches at the top and 33.5 inches at the bottom, ordering a 33-inch wide door and shimming and caulking at the bottom is recommended. For height, the ordering measurement should correspond to the bottom of the top track. If you want the bottom of the top track at 70 inches, select 70 inches as your height. The top track itself adds approximately 2 inches to the total height, so the overall assembly height will be about 72 inches. Regarding delivery, while custom orders typically take time, a $50 rush delivery service is available to prioritize your order in production. This option can improve the chances of receiving your door before June 10, but delivery by that date is not guaranteed due to manufacturing lead times and current peak season demand.