Have you contacted a local Mercedes Benz dealership? I was surprised at how affordable genuine glass was when I replaced the windshield on my '59. I do not know how the dealers work in Bulgaria but shipping was free to the dealership I just had to pick it up. It was under $400US. I have not priced a W108 windshield but it is probably worth a call to your local main dealer parts department if you can't turn up a used one.

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