It's a shame that you cannot buy these new anymore. Mercedes will change that if enough people use their demand based request tool to remanufacture NLA parts. Three simple steps:
1) Click this link:
https://partssearch.mercedes-benz-classic.com/parts/demand
2) Enter your part number. For example, enter A1158350207 for the W115 heater blower motor
3) Then, email:
bernick.alvarez@mbusa.com with your part request. He will be able to push for this part's remanufacture as well.