Mahr Federal is the new manufacturer. If you take the anvils out and turn them around, you can grind them flat, put them back in the unit and them lap them parallel to each other.
We've been thinking of trying carbide plug members instead of the replacement anvils, but we haven't tried it yet.
The last time I ordered new inserts from Mahr was 2/2012 and they wanted $356 for the pair. Part # is 5355740.