I just had the back glass replaced on my 84 300SD for $256 =tax by Safelite. The milky areas in the corners finally got to where they were extended about 9 inches into the glass and the heater no longer worked. All the junkyards had windows that were milky too and there was no guarantee that anyone I hired would not breaK the glass installing it. I bought a new gasket from Caliber (an MB dealer in Anaheim with reasonable parts prices).
When safelite quoted the job I had a choice of a laminated glass like the original one or a tempered glass. I wanted to keep it original so I requested the laminated one. When the guy arrived he had a tempered glass but it had the stock number of the laminated glass. They shipped in another window and it was the same. We finally figured that the laminated glass was no longer available through them and that they just had not adjusted their computer yet. The dealer had one but it was $750. He said that 86 to 91 126s have a different glass (Maybe to cure the milky delamination problem)
I found a place on E-Bay that advertised all types of windshields and back glasses, so I wrote an e-mail E-Bay sellers inquiry to ask whether He had a laminated back glass for a 300SD. When I didn't hear from him i went ahead with the tempered one. Safelite did a great job and Everything is ok now. They had to use a little extra goo because the tempered glass is thinner than the laminated one.
One week later I got an E-mail from
henrylisk@earthlink.net telling me he had a new laminated glass for my car for $177 = 76.55 freight to anywhere in the lower 48 states.
The installer said that my original gasket was OK but i used the new one anyway because i am tired of having water in the trunk. Anyone who wants it can have it.