I have a blower motor for a 1994 E320 with air filter. There are posts you can reference on removal but you need to know if your Mb has an air filter. I found my problem was a clogged air filter to the blower motor and I did not need to replace. I went thru the whole scenario and ordered from an aftermarket for it and it was not at all compatable. I had a salvage yard pull the whole assembly for me and I never had to use it. It is OEM and works. They want a lot of $ for it but I will give it to you for half than what I paid for it. $125 and I will get it to you.
Tom