New Glass?

[kna4977]

I am thinking about replacing the glass in my 72 K/5. The windshield, door glass, and vent windows are all available. However, the top glass is not. I went to a local auto glass facility, and they told me that the glass could not be cut for the top as it is tempered, and that the top flexes since it is fiberglass so they would have to find NOS glass. Is this true?

Also, how much should it cost to replace the glass?

Any leads on where I can get new glass?

thanks