Try putting a parts request in through the partsShop tab above. They will ask your make, model, and VIN number, and will give you a part # and price quote specific to your car with genuine MB parts - prices as low as I have seen anywhere, and it supports this site! I have had great service from them. Also, there is a sample page and table of contents from the MB CD shown under one of the tabs above, DIY, I believe. Hope this helps, good luck with the blower motor.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E