I also have a ‘78, that is very cool, mine is also Freeborn Red.Got a replica window sticker from @cwags12 I was very pleased with the way it looks. He took all of the information I had on the vehicle and made me one that looks very close to what I would think the original looked like. Very glad that there are people out there taking the time to do things like this.
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You could make a paper template from your broken windshield also. We have a glass company through our local Ace Hardware that cuts laminate glass. And our Ace has large paper on a roll to use for the template. I have sent many paper templates to them for laminate windows for loaders and other equipment. And they have always done a wonderful job.
It looks like your original windshield was not tempered (safety glass) by the way it fractured.While driving down the freeway yesterday a rock hit the top edge of the windshield . It knocked top of the windshield out going 65mph. Just a loud bang and more ventilation, I just kept driving home. Now looking for a new windshield