Sliding windows for passanger van?

[seventhree]

HI folks!

This is my first post and sure to be one of many. I am new around these parts and putting together a new van for some fun this summer. I'm the proud new owner of a 02 quig with a 7.3. Its blank inside and I'm looking to start making some changes. First up is swapping out some windows. I have tried searching the forums here but until I learn how to navigate them better I'm hoping to make some friends and have some simple questions answered. If you look at the picture you'll see each side has a HUGE window that doesn't do much. If there was an option out there to make it a half slide that would do wonders for ventilation and comfort for me and my lady. Does such an aftermarket option exist?

Thanks,

Sean