Midway or Brownels both should have them. Get a bolthead for a 30-06 for a 25-06 as it is a necked down 30-06. A new extractor, spring and ball and ejector and spring is also a good idea. Magazine lips may or may not need tweeking, New bolt heads dont come with those parts. if you try to use the old parts, disassemble in a plastic bag or parts will fly due to spring pressure. Under the extrator is a spring and a ball bearing that fits into a recess under the extractor. To remove the extractor simply push it off the bolt face, and the ball and spring will fly out.

El Lobo