Help needed with tailgate '71 Suburban

[darkpino]

Hi!
My name is Martijn and i'm living in the netherlands.
Just 10 miles away from our capital, Amsterdam.

I bought my suburban 4 months ago now.
I'll post some more pictures in the next couple of weeks but i already added one.

Only my tailgate (the up tailgate, the one with the window in it) is getting really bad.
And i mean REALLY bad...
I was interrested if any of you guys know some place where i can buy these new?
Or used?
I tried some things on google (and to be honest i didn't search for it very long) but without any satisfieing results

Hope you guys can help me cause it's giving me a real headache...

Here's a pic of my burb, will put the big story and what i already done to her in the next couple of weeks.

The best,

Martijn