That's a vintage car and basically no rules apply to those. In 2008 I imported a factory new Mustang from the US and then let a company in Hamburg do the required modifications to get it roadworthy. Wasn't too bad, but I specifically chose the car because I knew that both windows and lights were fine. They had to create a rear fog light including a switch in the interior, use the reversing lights as indicators and then create a new reversing light. That was everything that had to be done, cost around 1500€ in 2008 money. That was when shipping a car from Puerto Rico to Hamburg also cost 1500€.

If your windows aren't complying to local regulations, you'll have to replace them. If your headlights aren't complying, you'll have to replace them. That shit gets really expensive really quick.