I wound up getting a local body shop to order the sliding doors from Nissan. They said the left side was discontinued and I could only get the right one. The right one was the one I needed anyhow because of the bad blind spot. When the window came in, it was boxed wrong and was for the left side. i kept it and reordered and got the right side next. It worked our great. From Nissan the windows were less then 100 each. Was well worth it and it is safety glass so if it ever shatters it won't be littls peices flying at me.
I did a camper conversion on my NV200 last summer and purchased vented windows for both sliding side doors from Campbell Nissan in Edmonds, WA. (They do a conversion to the NV200 called the Caravan Freebird.) The windows are great. You can see pictures on their website: https://www.caravanoutfitter.com/
I measured it out and this size will fit on the slider door. I plan to cut the non-glass slider door. I think the advantage over the Campbell Nissan one ^ is that you could keep it open while driving. But I'm unsure if the curvature of the door will work with the flat window.. thoughts or suggestions please!