Hello - I'm attaching a link to our site's DIY tech articles on the W123 platform where we have quite a bit of info on the blower motor. If you have any questions on parts, please feel free to give us a call at 888-280-7799 and one of our MB part specialists will be happy to help you out. Hope this helps and best of luck!

Mercedes-Benz W123 300TD (1977 - 1985) Technical Article Directory | DIY Maintenance and Repair Projects for MBZ 230, 240D, 280 CE, 300D, 300TD | Pelican Parts