There are several threads describing this process. Do a google search from outside the forums for "wing window rebuild airforums" and you should get a few threads.
Since you have a 69, with the rare windows, the simplest thing you can do is order a new window assembly (frame and all, you can't buy just the glass), drill out the bucked rivets holding the window frame in place, remove it, goop everything up with lots of vulkem, and then install the new window using Olympic rivets.
When you order your replacement window, you might also get a rock guard assembly to protect your front windows in the future. You might be able to combine the shipping on all of this (as the shipping for the rock guard is high due to its size). Outofdoorsmart.com was recently offering a sale price on their rock guards.