Hi Rayce, I'm pretty sure your glass will be flat and therefor left and right are the same.
Re;glass thickness,I got mine made up in 5mm Green tinted tempered glass,it's pretty close to the original thickness and came with all the relevant safety markings etc.
Laminated glass is a MUST for your front windshields but I would go for the tempered glass in the sides purely for longevity. It wont crack if you accidentally slam your door!Or de-laminate for that matter.
Jimmie D's right though,it might not be as expensive as you think to get them made locally!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.