Have a sliding door kitchen door, would like to add something like this product for privacy. both glasses are 45 inches wide and would like 60 inches long What sizes (L & W) do you recommend ordering?

This is a 50" tall pattern when you install it sideways/railroaded. You would need to order 8 feet to cover the width of the 2 panels at 45" each. (based on the sizes you provided). If you want to choose a taller gradient pattern, you could select from these 60 and 71" tall choices: https://www.decorativefilm.com/product-search?Search=gradient