They are not factory fit so you are looking aftermarket. Try searching for campervan windows or horsebox windows. This will give you a whole range of different options that you then just need to choose the size you want. I have rear windows in my hard top that were there when I purchased it, on some research I think they came from a horse box. if you want to stick with land rover factory options you can fit a single station wagon window in a hardtop side but they are two large to fit a pair like you have in your pictures or I have on mine.