1983 300SD Rear Windshield Size Different From 1985 300SD ?

I wanted to replace the rear windhshield in my 1983 300SD with a better one which came out of a 1985 300SD. I purchased the new seal made by Meyle from Mercedessource. The auto glass place was not able to install it because the 1985 glass is about 1" longer than the old one out of the 1983. Both cars are W126 models. Is there a series of years which will fit one but not the other? Is it possible to buy a new glass at a reasonable price? If yes where?

Thank you
Dieter

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