All right now, its not where I bought mine but just went up to Advance Auto walked in said I was looking for a 1 1/4 freeze plug, he asked shallow or deep. Walks back to a slide out tray. pick up a few that are connected with plastic and pulls one off brings it up Made by Dorman part number 362647.1 and says 1 1/4 right on the package. I'd try another parts store like Auto Zone or Advance Auto or Federated if he can't just walk back an get you one. I think mine was like .73 cents with tax. Also you can try it without replacing the copper seal at the top of the header but if its leaking you need to replace it. Torque on header bolts is 19Nm.
