After reading an interesting post on the DeLorean Mailing List about a cross reference blower motor, I decided to pick one up.

The part # for this is Siemens PM106, and it is a drop in replacement for our blower motors. AutoZone carries these sparsely, if they have it in stock its $18.99, if they special order it $24.99.

Took the old motor out and saw that there was some rats nest gunk in the exhaust line. Cleaned that out and transferred it and the basket to the new motor. Replaced it and cranked it up, much quieter than the old motor. Would highly recommend this cheap replacement if yours is making loud noises.