Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There is a company called "Rock Auto" Here is a link to it. They show to have anything that you need.
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1012655&parttype=6557&a=FRc1012655k1190648
REMOVAL & INSTALLATION3 Series Models
The blower is accessible by removing the cover at the top of the firewall in the engine compartment.
To install:
It is serviced as an assembly and looks like this.
ASE Certified Technician
ASE Master, 30+ years exp. former shop owner, diagnostics, driveability tech