I have a relative in the glass business. I suggest PPG or one of their related companies as being the best, according to her. You aren't going to find Sekurit unless you want to pay $$ and get it direct from Germany, but she puts PPG (and there is a subsidiary whose name I cannot recall, sorry) in all their MBs with great success.

List on mine was somewhere north of $400, but my discount gave me a new screen for $220 installed (lucky me)

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL