done several, used to use Bish adaptor. Now just take combine and pull it up to throat of header, line up everything, and fabricate top lid or frame, reverse the drive shafts left to right, slot the holes so shafts can be moved reaward an additional inch and cut holes for roll out hooks to latch on with a reinforcement plate for botom latch. Bish offsetts the head as it is centered on the throuat head , we mounted them heads up on the rows with the throat offset as the hugger heads are. In this case the shafts have to be set up a little different - can't remember the exact details.