OK Catalina400, here's some info. I got this from an English magazine which is dedicated to American car enthusiasts.
URO GLASS
Tel +1527 577477
Fax +1527 576577
These guys say that they ship worldwide so I suppose shipping from England to Germany would be just around the corner for them!!
PETER JONES
Tel +1582 881260
Fax +1582 883287
Cell +7836 208478
This guy says he delivers all over the UK and can arrange fitting
ALLGLASS Mobile Services
+20 8311 5663
These guys say they arrange windscreens for all American cars. They have a website
www.allglass.co.uk
I don't know the International dialling codes from Germany so I put a + in front.
Let us know if any of these guys can help you. In fact, I would think you could make a weekend trip over to England. Drive over, have the screen fitted and drive home. You will be back on Sunday night just in time for a big feed of Huxen
Good luck
Ian