To the best of my knowledge...........The stretcher door was never offered with the float plane option. Aircraft have been modified after production with stretcher doors. I have seen a photo of a 185 on floats with a stretcher door. Although unique, I see only negatives to the stretcher door. My opinion on the stretcher door is that it adds weight, bad, it is another seal and door latch to maintain, bad. It's another door to let cold air in, bad. It GREATLY reduces the structure of the airframe at a very crucial point, very bad. I have an extended baggage and can reach to the back of it through the standard baggage door. I think the stretcher door devalues the aircraft. It's much easier to load long bulky items by removing the passenger door and seat, this take me about a minute. If I was hauling stuff that required the stretcher door, I would be much happier with a turbo 206, much more comfortable to sleep in too. If you want a cargo haulin' 185, search for info about the Alcor Cargo Door.