[MC1600]

I got screens and gaskets.  What else would I need to replace?  My rings/glass are in excellent shape.  Is there something else in there I'm missing?

No, I'm not saying you're missing anything.  I would just opt for switching the window to the new style as the new style gasket is far superior to the old one.  The old style does not compress enough and therefore is likely to have areas along the perimeter that are not sealed.  If you put the new gaskets in and have no leaks, you're good.

Gotcha.  I'll check and see what that would take.  Based on the sizable investment already made on the newer style gaskets, maybe it wouldn't take much more to just replace the whole set-up.