Product review (4 stars): Durometer seems a little low but it does work!
Installed and no more leaking!  For those who are planning on doing this job by themselves plan on having help removing and reinstalling the actual drum.  It is heavy and awkward to remove.  Aside from that the job is pretty straightforward.

As far as the seal itself I wasn't overly impressed with the quality of material.  The one I replaced showed significant wear and was malformed.  My fasteners may not have been torqued properly from the factory but regardless the material used for this "o-ring" seems to be subpar for this application.  I'm no expert but a stiffer seal would have lasted longer IMHO.  It did seal the drum though so it earns 4 stars.