Jack, I'm also needing to replace mine. I found a nice stock replacement on e-bay. A friend that builds motors for a living insists I remove the motor as the rear main seal is such a PITA to do in the car. I'm doing the front end over also and it gives me a chance to clean and repaint the front end with the motor out of the way.
Let us know how you make out I'd like to know how the real seal works out for you.