Hello everyone. I recently got into woodworking and also joined this forum recently as well. I purchased a Delta 43-379 shaper at an auction for a good price yesterday. This is my first time owning a shaper. I would like to buy molding head cutters for it but I didn't get a manual with it and I'm not sure exactly what the bore size is for the cutters. Would someone be able to help me with this? Or if they have a manual for it that they can share, I would really appreciate it.

Thank you
-Sam