We have now been supplying our re-manufactured intermediate plates for a little over a year and have had no trouble with them in the field.
This is not merely an intermediate plate with a machined center; we manufacture a new center section and replace it completely, making sure that your clutch stack height is right and your clamping force is what it should be.
At $720 with core exchange, they are less expensive than a new one, and certainly less of a "chance" than a used one (if you can find one).
We have models for all pinned twin-disc clutches from 1980-86.
We do not make one for the 78-79 concentric clutches.
928motorsports.com/parts/intermediate_plate.php 
