I've got a '77 13'.  The front and rear windows have the middle third or so that tilts out.  When I got it, the front had some weather seal on the opening portion.  The rear only had some faded remains of glue.  Both windows leak like crazy. 

Does anyone have a picture of what the seals on these windows should look like?

Is it possible to put screens on these windows?  Without screens I'm wondering if I shouldn't just replace them with solid windows.  Everywhere I go has too many flying bugs to leave open windows.

Thanks,

Todd