I thought he was talking about the screen that goes behind the seats to cut down on the wind. I get the impression that you are talking about the windshield glass. I checked on the Mercedes windscreen for my 560SL and the cost was about $375. An aftermarket homemade version is sold on e-bay for just over $100 I think.

__________________
Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles