Thanks for pointing this out FireLance, you've very sharp eyes. And Wow. Golems have just got easier...
Flesh CR 7: Fort +3, Ref +2, Will +3.
Clay CR 10: Fort +3, Ref +2, Will +3.
Stone CR 11: Fort +4, Ref +3, Will +4.
Iron CR 13: Fort +6, Ref +5, Will +6.
These are the 3e figures, but if...