A couple of thoughts (assuming w123 wagon):
1) An automatic sunroof panel will work. You just need to carefully cut a hole. I actually managed to mess up cutting one... 
2) You can have your existing panel recovered at an upholstry shop. Unfortunately, if you're car is 82 or older the vinyl won't match exactly. Only the "newer" palamino vinyl color is still available.
Good luck searching. They're hard to find in good condition and some sellers want kind of a lot of money...
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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)
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