You need to look at our website to see what is new style.
Should you have questons never hesitate to contact us .
The New ones are considerably quiet as it is gasked 100 %, while the older
ones use a fin gasket that does not seal very much.

Where would you want a power window? Cockpit? imho nothing beats the speed of the original windows (opening and closing).

The original windows came in two versions; early had multipiece frames and the locks were on the sliding window, later had single piece frame and the lock is on the fixed portion (I hope I remembered that correctly!). The first design of replacement windows had a small sliding portion for fresh air. The second design has a small folding portion that opens for fresh air by being hinged at the top.
When folded out, it keeps the rain out of the coach fairly well. This is the design that JmK is now selling.
The original design lets in more outside air flow. But, with A/C, this feature may not matter.

I think if GM had done a little more testing in the Deep South, keeping the coach cool would have been a higher consideration.
Replacing the windows is not difficult. Hiwever, the interior trim will no longer work.
Tom

As I understand it, there are two styles of original windows on the
coaches, and they can be swapped, if you do it frame and all, the body of
the coach did not change.

The earlier style has the moving part forward and outside, and the screen
is on the inside, you you open the screen, adjust the window, close the
screen. I have 1973 coach, so I have these.

Part way though the 1975 model year, they switched styles, with these, the
fixed portion is forward and outside, and the screen is outside. You can
adjust the windows without touching the screens.

The later style is said to be quieter and more air tight. The earlier style
lets you walk around the outside of the coach and close all the windows (or
open, if they are not all the way shut), so they aren't all bad.

If the opportunity came up for not too much money, I'd switch to the new
style.

Some people prefer one style over another, kinda for their own reasons.
Both types leak water equally. The new ones, properly installed, do not
leak at all, and as an added bonus, are much quieter when under way. One
perceived disadvantage is that they do not provide as much ventilation.
They are easier to open and close, and are not big enough for people to
crawl through, so I think they might defer some break ins.
Jim Hupy